The premise of the movie is probably going to keep a lot of people from watching this movie, but that's as it should be. It's a movie by and for fanboys (of either gender); fans who enjoy sci fi movies, comic books and TV shows, and immerse themselves in them to, arguably, unhealthy levels. The acting is good enough, the storyline foolish enough to please without getting baffoonish. Enjoyable, all around.
This movie is definitely a lot of fun. The actors have aged a bit, the plot is a bit "out there", but it legitimately feels like another fun ride with Indiana Jones. Lots of good chase scenes, fisticuffs, and mysterious riddles along with some excellent nostalgic moments make for an enjoyable experience.
This was a movie split in half. The first half, with the most valid arguments, was entirely a discussion of the firing and/or blacklisting that can be a consequence of professionals (in educational institutions and in the media) who discuss the concept of Intelligent Design. This is fairly even-handed, and Ben Stein (and the film editors) give a good amount of screen time both to the "persecuted" and to the accused. Very good, balanced, and interesting throughout. The second half is a bit less fair; it begins a bit of analysis of Darwinism, solicits a few opinions from supporters, but also does a bit more of a heavy-handed treatment of the subject. It does, rightfully, connect the National Socialist movement in Germany with eugenics (which was largely supported as an extension of Natural Selection) but seems to use this as a moral attack on the ideas of Darwinism and evolution in general. Throughout, Ben Stein's commentary keeps the pace of the movie enjoyable, and there are a lot of things to consider. In the end, it is reasonable to ask, why can't the I.D. people ask?
Overall, this is a good romantic comedy. Simon Pegg does a great job with physical antics, emotive goofiness, and generally playing a role. Nothing tremendous, just a good, solid romantic comedy with nice acting and an intriguing story.