I rememeber that he was really disappointed. Or maybe disillusioned would be a better term. He had never seen Roth with Van Halen and was really looking forward to the live show.
The saddest thing of all was when he performed the bluegrass version of Jump, and looked so insanely happy just to be on stage. That's on YouTube as well... and it's just cringe-inducing. Though I'll admit, hearing a banjo player rip through an Eddie Van Halen solo was quite entertaining - in a completely surreal sort of way.