Yeah, I have to add my voice to this viewpoint too.

I definitely have annoyances with Yosemite – GUI performance on a rMBP is lower, which is particularly noticeable during Mission Control use. I've also got the irritating slowdown/flickering menu bar bug that I've seen people report. But generally everything else has been pretty great.

I do wish Apple was more public about bug tracking – I'd love to see a public database of known bugs so we can track progress or something like that.