Well, I've had very few problems with online. It seems to be very hit or miss at times. As things are now, the game might work fine for you, or it might not work at all. Personally, my online experience with the game has been generally positive since I first bought my copy, so I can't really complain too much. There are the few games where people end up dropping randomly, and how long it takes to actually get a game started, but that's a small speedbump.
Basicly, if it works, the game's fun enough to warrant the buy, but if it doesn't, quite simply, you're better off waiting for the kinks to (finally) get fixed.