what is so bad about Unity? I find nothing wrong with it.
it's been proven to decrease performance
amazon search results in the dash for everything, you can only opt-out after you install (ubuntu >= 12.10)
most seem to dislike the global menu
it's hard to navigate through
you can't customize it as much as LXDE, XFCE, GNOME, KDE, etc.
the stupid overlay scroll bars