Transformers 3: Dark of the Moon
Unlike you, Greeny, my expectations were in the right place. I saw it in Imax 3D and paid as little attention as possible to the storyline/acting/etc. and simply enjoyed explosion after transformation after explosion, and I have to say, I thoroughly enjoyed myself.
Having said that, I have no intention to watch it ever again, but holy shit can Michael Bay blow shit up in style.