I've been playing it for a few days now and just can't seem to stay interested. Made it to level 10, robbed all 20 stores, escaped a bounty for 24 hours, survived a gang attack and bought an apartment.
I've hosted and joined races, games and death matches, but most players simply want to run around the city and shoot each other while talking trash. After doing those things over and over, the game just gets plain boring. Not to mention the game freezes up on me regularly, despite all those patches.
There's just simply no reason that I'm aware of to play for 90 more levels. The single player game was much more interesting.