Agreed. American Football is phenomenal. I actually like it equally as much as Rugby Leagtue.
If people try the sport and then don't like it then that is fine, but people who just dismiss it and go oh it lasts 4 hours, too stop start annoy me.
Even for a meaningless pre-season game i was at over there (Green Bay (my team) @ Jacksonville) it was probably the best sporting event i've been at.
Although it can get complex, like any sport the rules are extremely simple for the most part.