I have a competitor. You'll never guess who.
I got her the PC version for her birthday, and she is completely addicted. She's only a few quests behind me. I beat Gruulkar about 4 tonight, and my mom just went up against him at about 8.
I'm still at a lower level than her, only 34. She's maxed out at level 50 already. So I suppose it's an accomplishment that I've gotten further than her at a lower level, but it's still a little embarassing. I can't even compete against her head-to-head since we're on different platforms, so the only real way I can dominate her is to beat the game before she does.