Freakin classic.  I'm glad it wasn't just me.  Assassin's Creed is pretty darn good (at least as good as console ports go these days), but I thought I was missing something, because I could NOT for the LIFE OF ME figure out how to quit the farkin game.  Alt + F4 works fine (which is how I resorted to doing it), but it can (and did) corrupt the profile.