Rubber band scrolling. Stupid idea on OSX as now in the Finder you scroll down and you want to access the last file it bounces up so you can't quickly click on it, Also in a textarea box on a webpage it scrolls outside the box. And no you cannot switch this off without switching off smooth scrolling altogether. Still no tabbed Finder, multiple clip board or attach notes to files. The way Expose and Spaces was changed from SL. Dull grey icons making it less immediately obvious what they are. Reduction in mouse gestures as they are moving to trackpad which is not possible to use if doing precise graphics work. I could go on.
I never said it wasn't possible to create content on Lion but they really haven't added anything new to expedite workflow and have in fact made it worse. All the social media integration is fine if people want to use it but give us pro's some more benefits too.