First off I gotta say, I think the driving feels very hokey after getting used to driving in GTA4. More like old style GTA's or Saint's Row (an arcade feel to it), whereas GTA4 felt more realistic. I know they aren't same company making them, but wanted to point that out seeing as someone mentioned it.
And the game does feel short for a 3 disc game really. If the DLC for a game is out the same week it releases, shouldn't that content have perhaps been ON THE DISC???