Transformers 2:
To be fair, they didn't have the script a third done before the writers strike put an end to development. But they went and filmed it anyway.

Anyway, last one for me was Ratchet and Clank. It was so bad I still won't go to any movie recommended by the guy who picked that one. I could have written a script that was better, and I haven't played the game since it came out.