There have been a few issues of which we have discussed some here. It feels a little rushed, but it is the challenge of the new direction.
Earlier we said wait for the first Service Pack, but these days that is a release including new features as well (possibly introducing new, so far unknown bugs) and so there's no stability to wait for anymore, that happens in between releases (hopefully).
I am still waiting for a working search implementation since Windows XP and by now I would think it is time to go back and do some work on that function... Preferably from scratch! Still Microsoft obviously think it works, but spending minutes searching a single folder hierarchy is not my idea of a working function. Try a tool like Everything and you will agree.