I just haven't been able to really dig the online play like i did the single player. Maybe it's because every time I get into a game with random people every one of them tries to murder me. Gets a little boring. So I start most games as invite only, that's boring, too, but at least I'm not getting murdered every five minutes.
Maybe they should have created an online game mode where players cannot kill each other, so that those of us who just want to do the races and missions and not get murdered all the time can actually enjoy playing online.