GTAIV. The weakest addition to the series yet. Running and climbing over things was needlessley awkward, I only ever used two or three guns in the entire game, car handling was pretty terrible, and the story was utter garbage. It's like they took a J-RPG story and Americanized it. Instead of over-long angsty dialogue, we get critically short sentences traded between characters in the most manly way possible, even among the women.
Ninety percent of the game's features don't even get a look in, because once I've done the main story, there was no real motivation for me to go back and do all the useless crap like hunt down x amount of pigeons and blow them into feathery dust clouds. Seriously, at least give the game some replayability other than the occasional bored moment where I shove the disc in and run down a few pedestrians before hurling myself out a car//truck/bike/helicopter at maxiumum speed.
Funniest part in the game? The swing glitch where you could catapult cars several feet into the building behind you.
And the multiplayer was just awful. Trying to find a game for any of the interesting modes was like watching paint dry. It was like the matchmaking from Saints Row. Free Roam was just bloody retarded, with pill-popping barely-teens ramming my crappily animated avatar at mach ten in a sports car.
Rockstar's Potential: WASTED