Taylor -
I agree with a number of other posters in the thread - if you and your band finds what you're playing is appropriate, then it probably is. Hopefully, if it's not, they'll feel the freedom to tell you so. What the audience is saying is certainly a factor in you and the band judging appropriateness. It sounds like it was working for the audience too, except for a few old fans. If your presence causes the band to go somewhere new, and you're all onboard for that journey, how can that be wrong?
One other comment on the thread. Hydrargyrum said: and Victor Wooten would probably have been bored playing with Pink Floyd. Hmmm... Maybe, but I'll bet not. And I think Roger Waters would probably have a hard time sitting in with the Flecktones (too many happy songs, right?), but I bet he wouldn't be bored either.
Here's a better example - how about Steve Morse playing in Deep Purple? Yeah, I'm not quite sure how that happened (well, of course it's for the money) and what Steve Morse is thinking about as he waits for the next chord change to come up...
David Fung