I've enjoyed QUESTOR every time I watched it, but I also think that it would never have gotten better than that first pilot.
Reason1 - the most interesting character was the antagonist, who would definitely not be back intact.
Reason2 - Gene Coon did the rewrite they shot, or something close to it. I'm thinking that antagonist is mostly Coon's work. Coon was dead before they shot anything, so again, all downhill after that.
GII was kinda slow, PE was fun (made me think Saxon might have been an okay Kirk), but none of them really knock me out, SPECTRE included, though Culp and Young is awesome casting.