I saw "Bowling For Columbine" a couple weeks ago. The Marilyn Manson interview was indeed surprising.
Overall, I would say the movie begins great. Your interest might wane as it progresses. Near the end the scene with the K-Mart representatives was much too long.
This movie will appeal to many people but not everyone. It does not offer the excitement to sustain interest week after week. If the film quickly disappears from theaters in your area, then you know why.
The actual Columbine footage is very poor. One can only wonder why the school would own such antiquated video equipment. The free-after-rebate home webcam could do a better job than those library security cameras.
So, should you see it? Yes, but go during the matinee to save money. It is not worth paying the extra charge for an evening performance. This movie is good, but I would not categorize as outstanding.