Lots and lots.
Forty minutes on hold just to talk to someone (you can't cancel online). Unlike the "dude, our computers are down" guy, the CSR I got today noted that my account had been in "arrears" for over 60 days, so I couldn't get a refund. I asked to talk to a supervisor and after 20 minutes on hold got kicked back to the same rep. "An issue" was preventing me from being connected to a supervisor and I could call back later and ask to talk to a supervisor. I told her that they'd won and it was worth $50 to me at this point not to be on hold any more. So I paid up just so I could cancel my account.
I paid $50 to cancel my account. Let's all ponder that ridiculous statement for a moment.
I think this just made my decision for me about ever getting an Xbox 360.