I'll admit I'm critiquing from a business pov, but IMO it carries over to home users as well.
Launchpad, though one may be able to get used to it, is redundant. A more complicated Shift-Cmd-A if you will
Mission Control blends Spaces and Exposé in an effort to 'un-complicate' things. Use Spaces/Exposé and then use Mission Control. More helpful? IMO nope, it's something they should have left well alone.
This whole experiment at blending iOS and OS X for the most part has made people in my position groan, because as usual new apple hardware probably won't be compatible with SL