The biggest series is definitely still Grand Theft Auto, with San Andreas hitting huge amounts of sales and still selling on XBLA today and Grand Theft Auto IV making huge amounts of money in the first few weeks.
Grand Theft Auto 5 has already overshadowed both games in terms of early sales and any game in recent memory, with Rockstar Games earning $800 million on opening day for the fifth in the GTA series.
Considering the game took Rockstar Games $250 million to make, the biggest budget for any type of media (films, games, music) it is the biggest bet that has already paid off, with almost four times the original investment paid.
Take Two Interactive, the studio owner, has said this is the biggest game ever sold under the company branch and it is looking to become the most successful game of all time, eclipsing the likes of Minecraft in revenue already.
There are major factors that have come into play to make Grand Theft Auto 5 so successful, the huge fan-base, releasing it on Xbox and PS3 to around 150 million potential buyers and keeping silent about releases for next generation consoles.
It has currently sold about fifteen million copies worldwide and the way it is going we wouldn’t be surprised to see another twenty million from Grand Theft Auto 5, even more if they release solid DLC like they did with GTA IV.
As for the game itself, reviewers have been calling Grand Theft Auto 5 a masterpiece, Rockstar Games finest work and a commitment to showing older consoles can still pump out incredibly good, powerful and large games with breaking the console.