Awful, terrible, very bad, no-good movies

[fabfunk]

I have three questions, and I'd love to read thoughtful, interesting answers to them, hopefully have a conversation with some of you.

1)  In your eyes, what makes a movie a "bad" movie?
2)  What's the difference between a "good movie" and a "movie I liked"?
3)  What is the worst movie you've seen recently?