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The trailer looked good, the reviews looked terrible. So what did I think? Well, it's a film of moments. It has lots of decent, and even some quite good moments. But there is just no way to link them all together. The plot makes no sense, and I don't say that lightly. There is literally no reason why anything should happen the way it does, or why the characters act the way they do. It's as if the laws of cause and effect were suspended for the duration of its production.
That said, if you're willing to sit back and enjoy the moments, you'll find a lot to like in the Thing (Michael Chiklis) and the Human Torch (Chris Evans). Following their accident in space, they have the most extreme reactions to their new-found powers: the Thing struggling to cope with his loss of humanity, and the Torch determined to wring every last drop of fun out of his abilities. These roles give Chiklis and Evans the best material to play with, and they actually do quite well with it.
In comparison, Ioan Gruffudd as Mr Fantastic and Jessica Alba as the Invisible Girl take themselves way too seriously, and spend the whole film trying to one-up each other as to who can produce the best expression of earnest concern. Even Julian McMahon as the bad guy isn't particularly memorable. Oh, you're metal? How interesting.
I can't see myself watching this a second time, even when it comes around on TV. It's only really worth watching the first time if you like superhero movies, and have a couple of hours with nothing better to do.