I don't think I agree with some of the assessments about pass interference. I think 15 yards is a significant award for a call that doesn't always mean the pass would have been caught anyway. Yes, you would ocassionally have guys on a long bomb interfere intentionally, but if the guy is close enough to interfere, don't you think he's close enough to prefer trying to make a play on the ball or get an interception...you have to be within an arm's length of a guy to interfere, so I don't see guys interfering on every deep ball just out of stupidity.
On the other hand, while there would be occasional intentional interference calls, you would no longer see an offense pick up 40 yards on a pass that was poorly thrown just because the poor defensive guy couldn't get out of the way or when a defender makes a good play that some ref sees as questionable.
I just hate seeing teams get rewarded for crappy underthrown bombs or ticky-tack fouls. Right now it is smart for a team to heave up the hail mary anytime there's single coverage...I think if you start seeing more interference calls than you do actual good plays being made, something's wrong with the rule.