Can't speak for everyone but I have fewer problems (sometimes way fewer: are you listening Chrome?) than with any other browsers I have tried. To be fair, most of the problems are with University financial and student records sites.
Click on playlists and then STFU about the itunes 12 sidebar. If you do not like Yosemite why did you upgrade? It was pretty clear what it looked like if you read any of the reviews. So just go back to Mavericks and be happy.
On another note I do not know how I would like the 27" iMac gloss screen if there was a lot of glare in my office. The screen does face some good sized windows but they are north facing so no direct sun streaming in.