I really enjoy the single player, but after I beat all the tournaments I imagine I'll be done with it. The online is pretty fun, and my favorite part is that I haven't ran across any whiny kids cursing into their headsets, everyone that plays this online seems to be older.
I grabbed the game at BBV to since it was only $3.50 + tax, but I'm not boosting mp achievements until I can finish the single player achievements which aren't easy.