Oh man, Transformers was awesome. I went in expecting nothing, but it was great. I was filled with a sense of childlike glee almost the entire time, and I didn't even like Transformers as a kid. Even the incredibly cheesy parts like the names of the characters and how they had to, apparently, get a bunch of famous lines from the cartoons in there, bounced right off of the glee forcefield I'd developed just a few minutes in.
Definitely worth seeing in theatres.