lol others are thinking u want to know age rating.
i liked GTA4 but i will rate it 9/10 since apart from story, there is very less to do. and performance on PC is not so impressive. [does not perform good on dual core processors]
san andreas: 10/10 [epic game]
vice city : 9/10
GTA3 : 9/10
GTA vice city stories: 8/10
GTA liberty city stories : 8/10
GTA advance : 6/10
GTA : 5/10
GTA: episodes from liberty city : 8.5/10 [ballad of gay tony was awesome but lost and damned was boring]
GTA china town wars : 9/10
GTA5 : LOL / LOL
All the games have been given a M rating or 17-18 and over.
GTA and GTA2 are both 2D games with a birds eye view, they are pretty low key compared to the rest of the series, but still includes blood, violence, sex, and drugs.
GTA3 and on are all 3D, which helps give alot more realism to the games and have opened them up to being far more vivid than the previous games.
Personally GTA1 and 2 I would only let 13and up play
GTA 3 & Vice City - 15-16+
GTA4 and on - 17-18+