This movie is not about evolution vs. creationism. No, really. It has nothing to do with it. This is simply about people with differing views being silenced. Having gone to college myself, this has been observable. The rule is simple: if you disagree with evolution or even would like some questions answered about it, you can expect to come under harsh criticism at best. At worst, you fail (as a student) or lose your job (as a teacher). This move addresses these issues. Although it is clear that Ben is a creationist, he doesn't let that cloud his research. He follows proper procedure the whole way through.
As far as quality goes, this movie does an excellent job. Along with the raw research, Ben throws in a small amount of comedy. I'm not sure this helps his message but it does make the movie easier to watch. Final words: this is well executed, well documented, and entertaining. As far as documentaries go, you won't find much that's better.