Wow, that's amazing... one guy I never got to see, love the CSN&Y stuff, Manassas, solo work. Was it the sound... or was it an acoustic show? I get it though, I've seen Steve Miller a few times, different decades, and every one of the concerts sucked. He got into the habit of bringing on a guest "somebody" that no one had ever heard of and that was like half the show.
Worst ever though was Nazareth in 1981 or so... was looking forward to Hair of the Dog, stuff like that but it was probably the worst clunker ever, worse than Steve Miller.
I can't really think of one I missed but wanted to go to... but I'm sure there were some.