I had a really good time at this movie, but I am of the camp that didn't hate the first one. I thought that Iaon Gruffudd stepped it up as Reed Richards, and Chris Evans and Michael Chiklis continued to be great. My only complaints were Sue Storm's eye make-up, which was ridiculously trampy, and just plain bad-looking, for the entire movie, and Dr Doom, who still sucked.
The problem with Dr Doom, besides the fact that the writers took some serious liberties with the character, is that Julian McMahon really, really phones him in. It's like, he gets to play Dr Doom in a movie, and he could care less. It's depressing. His Doom voice (or lack thereof) is so distracting. He does, however, have more costume changes than Cher on her farewell tour.
These are two fairly minor problems with a movie that, overall, was fun, cool-looking, and entertaining. It's an honest-to-God superhero movie with crazy comic book action. Plus, and this is a little spoilery, Stan Lee plays himself in the movie. It made my mind explode.
I'm happy to chat about the specifics of the movie in the safety zone of the comment thread.