I played WoW for a year and a half with a friend. Then we hit 60 an neither of us felt like paying anymore, so we quit. I recently re-subbed and I think I've just wasted 15 bucks, because I have no desire to play. That said, I had a really really fun time when I was playing.
I'll reiterate the same old suggestions, Half Life 2 and Half Life 2: Episode One, The Sims 2 (it's a good game, don't worry about the people who claim it's just for girl) and also The Ship.