Movies: What movie disappointed you the most?

I've never watched the first transformers, but the second one I thought it was horrible. Usually I don't really watch any movies unless I know it's either good or something I enjoy. There was this Chinese film I saw, forgot what it was called, but it was so horrible. People only went to watch it because it had famous actors in it, but the movie was low budgeted, and the plot didn't go anywhere.