How exactly have Apple made "bad design choices" here? It seems, at this point, most people are annoyed either because they don't really understand the feature, don't want to unlearn old habits to re-learn new, generally more sensible ones, or can't accept that it takes application developers time to adopt the feature in their own application.
NOTE: Please remember the below are subjective opinions. But there are a fair few of us who share them.
1) Lion's gestures are massively inferior for fast navigation around programmes with multiple windows compared to Snow Leopard's
2) Mission control is like expose but worse in every possible way.
3) Resume makes memory management more difficult, and Apple wanted to make the need to manage memory irrelevant then they've failed.
4) Most people live in a shared household, have some form of privacy issues, and resume makes that incredibly difficult.
5) Most of the UX has had the colour pulled out of it, requiring more neurological processing to determine where things are and making it more of a chore to use.
6) Scroll bars were good. They told you how far down a page you were without having to move a mouse over.
Just about the only UX change in Lion I think is an improvement rather than a regression is being able to resize windows from any edge. And aside from killing resume most of these cannot be switched back at present.
Phazer