The game is simply the best in the series so far and here's why:
The storyline... What can I say about the storyline... It's fantastic. The best so far. The characters are fantastic, very funny and very good voiceacting. The story is very interesting and very fun to play. The story really grows in you, and it's almost kind of like a drama series, but much better.
The game is very fun to play, funnier than all the games in the series so far, because you can do a lot of more things than before but it still has it's limitations like that you can't fly aeroplanes or have parachutes and so on but it's worth it. Although the system rewuirements are very high, it's also worth it because it has stunning graphics and the quality is just fantastic.
It will keep you busy in months, maybe even longer than that, and it's a game that's worth anything. I hope that they will put the same characters in at GTA V from GTA IV because I really liked the characters. The people that have worked with the game, Rockstar Games and so on, have done a brilliant work with this game and may it be the same in GTA V as well!