That's true... but I also think that's what separates the fans from the fanatics.
When you watch a play for the first or even second time, you're concerned about down, yardage, etc. But when you examine the play more, you start to notice all kinds of subtle things that you missed the first time around. Things like, "Oh my God, Chris Snee just pancaked that tackle," or "Jeremy Shockey gave up on that route."
You get to really study the game tape. Dorky, I know, but I'm a fanatic.