There are a few NFL rules I don't like:
Pass interference being a spot-foul. Sorry, the idea of a 40-50 yard penalty is just ridiculous. If they're going to make it a spot-foul, why not use the same distance for offensive pass interference? If the foul occurs on 1st and 10, 40 yards down the field, penalize the offense 40 yards and make it 1st and 50.
The Wade Phillips Rule. The one where the other team gets the ball at the spot of the kick, rather than the line of scrimmage if the other team misses a field goal. If Team A goes for it on 4th down and fails, does Team B get the ball at the spot of the dropped pass? Of course not. They get it at the line of scrimmage. The whole game is based on the line of scrimmage. This rule goes against all football logic.