Second this — I like Compiz but the ccsm & gnome-tweak-tools tandem/overlapping configuration is a nightmare. Preferences must be imported/exported via GUI and they (frequently!) import improperly. Ccsm itself is a maze of dialogs, icons, and navbars that I dread to use.

My customized GUI really needs to be consistent across my machines, and Unity makes this impossible to guarantee and automate. Just give me an .rc file, text-based configuration is my favorite part of Linux.