Yep, the load times are quite annoying, and the game has froze once forcing me to reboot the machince. And mine isn't an older Xbox, I just bought my elite in December. I've also noticed some frame performance issues here and there, but not really enough to complain.
"You know, the best part of the best drug in the world isn't the high. It's the moment just before you take it. The dice are dancing on the table. Between now and the time they stop, that's the greatest high in the world."
- Walter Abrams