What is a movie that "looks like" it would suck, but actually is well written and acted and a good time?

This is top 3 of all time for me. There is so much happening in every scene you can watch it multiple times and still catch little jokes or sight gags each viewing.

I also expected a disaster. I wasn't prepared for how entertaining it was!

Having John Landis write the story didn't hurt.

Absolutely one of my favorite movies