The best sports movie I've ever seen is Moneyball.
I don't think I've ever seen a football movie even come close to that level. Closest was probably Friday Night Lights. Even though it was a heavily dramatized version of the actual story, I thought it captured all the best and worst elements of rural high school football from both a competitive and personal standpoint. The portrayal of the unstable relationship between the alcoholic father and his son was powerful.
I agree with whoever said most football movies are generally awful. The Blind Side and Gridiron Gang were unwatchable to me. Some are decent, like Invincible and The Express. And I actually liked Remember the Titans, even though it was pretty over the top. Most others I've seen were either meh or flat out terrible.