Drugs are a serious problem in the Philippines. A very cheap, easy-to-make, potent and dangerous version of methamphetamine colloquially called "Shabu" is extremely common across the country, and the capital is no exception. While this has lead to much violence, it is structured differently than in the USA.
While in the USA, drug-related violence usually occurs between two gangs fighting each other to control a market, with the non-gang affiliated civilians not being involved (or only as victims), in the Philippines the 'war' is being fought between the drug dealers and the sober citizens who do not appreciate narcotics being distributed in their homes.
In the USA, vigilantes are fictional caped crusaders seen in comics, movies and TV shows. They are the characters you cosplay as when you're at a con. In the Philippines, vigilantes are ordinary people. They're the regular non-using citizen who is so fed up with addicts dragging the country down while dealers get rich via the suffering of others that they go out there and publicly execute criminals.
This doesn't only happen with dealers, either. Criminals who escape the law, but are widely known to the public to be guilty are often found dead. These extra-judicial killings are common in the country and are generally tolerated by the authorities — after all, why worry about the death of a few criminals when you have other problems to deal with? They were filth anyway.
This has lead to such vigilante executions to become extremely common. To many people in the country, picking up an off-the-books assassination assignment is a great way to bring some more money to the house. 'Assassin' is a day-job for some people. Usually information, money and weapons are acquired from police, who then inform the nearest police station not to hurry whenever the murder is called in.
Even the element of the general public which does not engage in extra-judicial killings generally approves of the custom, as they all benefit from the drop in crime rates. One of the most famous groups of vigilantes in the country was the Davao Death Squad, which during its active years resulted in over 1000 extra-judicial killings of known criminals.
All that being said, don't take this as if the gangs would be friendly with one another and cooperating to survive, oh no. The gangs in Manila are more than rival with one another, as turf-wars are hardly rare. Many slums change hands, so to say, on a weekly basis. This frequent violence is part of what riled up the general public against the criminals with such a fervour.
Kidnappings and smuggling is also pretty common in the city. Being such an active port, you can bet that several ships leaving the city, or arriving, are carrying some kind of cargo which was accidentally left off the manifest. Much of the illegal trade between the Asiatic countries and the Americas happens via Manila. This also brings with it the unfortunate proliferation of human trafficking.
Corruption is also obviously present, what with the whole "turning a blind eye to vigilantes" thing going on. Other than that, the dealers are trying to push back with their own dirty cops, as allegedly there may be around 300 police officers in the country affiliated with the drug trade. The conflict has been escalating ever since Duterte has become president, as the man is very outspoken about his contempt for the dealing of drugs — to put things lightly.
Reliable murder rates and automobile theft rates are actually pretty hard to come by, though the former is higher than in most cities we've looked at over the course of these articles (unsurprisingly) while the latter is lower. While car has become the main form of transportation in Manila, thus making the city viable as a GTA setting, in many areas of the country it just isn't efficient. Cars cannot traverse the water, get stuck easily and weigh quite a bit, making them unpopular.
Recognition
Being the capital of the Philippines, Manila is well known internationally. Most people who have ever visited the Philippines probably traveled through Manila even if it wasn't their final destination in the archipelago.
Manila has plenty of popular tourist attractions that many people are bound to recognize. The old walled city of Intramuros features the most of Manila's surviving pre-World War II buildings. The Theatre at the Cultural Center of the Philippines is often visited not only for the performances, but for the architecture of the building itself.
Manila is home to Binondo, the first "chinatown" per-se in the world. While it has since been surpassed in size, Binondo is still the second largest chinatown globally. Rizal Park, dedicated to a national hero, also features the Kilometer Zero pole, to which all other distances are compared in the nation.
Some other notable buildings in the city include the Bangko Sentral ng Pilipinas, the Manila Metropolitan Theatre, the Natividad building, the Manila Cathedral, the Minor Basilica of Saint Sebastian (the only prefabricated all-steel church in the world) and the City Hall.
Story Potential
Manila would provide a great setting for a kind of GTA story that calls on elements from the previous games but in an all new way. Imagine the multiple protagonists-approach from GTA 5, but limited to two characters who are enemies throughout the narrative. Make one of them affiliated with a criminal syndicate, and make the other a vigilante.
Sometimes the missions would depend on which you do first. Maybe the criminal character is tasked with stealing a weapons-shipment from a group of honest cops. Either the player goes through with this mission, wherein the vigilante will hear of this and try to track down the shipment, or they choose to play as the vigilante who warns the police, resulting in the mission as the criminal being more difficult because there will be more enemies, however at the end instead of stealing the shipment, the character finds out the identity of the vigilante.
At the end of the story, both characters get the same mission, and similar to the final decision in GTA 5, you have to pick which you will play as, the objective being killing the other. Both characters would have some kind of map-controlling side-objective. The criminal must expand the control of the syndicate to districts, while the vigilante would work together with honest-but-off-the-books cops to clean out districts. These would provide bonuses, forcing the player to choose: maybe I prefer the vigilante, so I clean out a district, but then my next mission with the criminal will be harder.
Now, such an approach would provide the story team with some unique challenges. They will need to write the characters in such a way that both are relatable, or everyone will automatically pick to favor the vigilante. They will also need to write the story in a way where player immersion is not ruined by the fact that often the player will know information their character does not.
Now, if Rockstar manages to pull this stunt off, they would go down in gaming history as having written one of the best narratives ever. If they don't, they'll be known as an ambitious team which bit off more than it could chew. Based on the quality of the writing in GTA 5, we'd guess the former of the two would happen — though Rockstar might need to give its writers a raise along the way.
Final Verdict
A+Pros: geography, crime profile, recognition, story potential
Cons: high-end sports cars might seem out of place in this setting.
All in all, Manila has the characteristics to be a good GTA game by default, but it has the potential to be an absolutely ground-breaking and stunning GTA game if Rockstar is inclined to take risks with the main storyline. Obviously, the mere idea of playing as a drug dealer in a Philippines setting would be controversial enough to spark the next ban-GTA rally, but balancing a dual-character story where the two protagonists oppose one another would be an amazing feat.
Would you like to see Manila featured as the setting of a GTA game?