I played with it some, and besides the fact that only a few geeks were using it, the UI was terribly frustrating: it was slow, and had just enough "desktop app"

I played with it some, and besides the fact that only a few geeks were using it, the UI was terribly frustrating: it was slow, and had just enough "desktop app" functionality to put you in that mindset, but not enough to actually behave like you expected (kind of an uncanny valley sort of thing)