THE GOOD: Online multi-player, co-op, crazy amount of customization, more user friendly than GTAIV, mini-games and fighting styles. Even though I feel the music is not as good as the first game, the music is still good. Unusual achievements.
THE BAD: although the graphics aren't bad by any means, they haven't really improved since the 1st, some small glitches here and there. The police in this game are some of the most annoying ever, but unlike GTAIV you have a gang to help you out. They shortened the list of radio stations. Before it was like 14 stations, now its like 9 or 10.
SUMMARY: The first thing that came to mind when I played this was GTA:San Andreas, my personal favorite of the GTA series. Thats not a bad thing, it feels like they took GTA:SA and expanded it and put their own funk on it.
A big plus is that every vehicle is unlocked from the get go. Cars, trucks, planes, helicopters, boats and jet ski's are there for the taking and very easy to use.