[Niten]

Some people have legitimate complaints, there are a couple minor bugs and glitches in Unity still. But mostly what I see is knee-jerk resistance to change; even if Unity is a better UI, they hate it because it's different from what they're familiar with.

It's exactly the same kind of hang-wringing we saw from a lot of the GNOME 1 users when GNOME 2 came out.

[wyclif]

Sure, some of it is resistance to change, but that's not all of it. It also has to do with users, particularly power users, having their workflow broken. That was essentially Linus Torvalds' complaint about GNOME 3 being a mess, and why he's now back on GNOME 2.