I think this is a great game though it sort of detracts from the paths of it's predecessors. I think that this game takes itself too seriously. It's missing some of the things that made Vice City and San Andreas such great games. I didn't mention GTA III because it was the first Vice City game which used a 3rd person perspective.
I think that the environments are clean and very detailed. I like that the NPC's are so varied and each have their own personality. I feel that this game is beautiful and very well finished but could be more gritty like it's predecessors.
Niko is a very likable character and probably the most personable of all the other GTA main characters but I attribute this to the writing. I'ts the same writing that could have made the game a funnier experience instead of leading this game in a path that's too realistic.
Either way I feel that other than the main storyline this game posseses all the fun of the previous games as far as wreaking havoc and mayhem on the city after having passed the game. The Multiplayer is good. This game is definitely worth having. The story is great this game is near perfect.