I know my opinion won't be popular, but I'll throw it in the discussion -
Having been a passionate fan of all 4 of the major sports since the mid 1970s, I hate what replay has done to the game. Yes, getting calls right has added some level of fairness/justice to game outcomes, but I fell in love with sports when the human element was a big part of the whole mix. Fans would scream foul every week when a perceived injustice occurred, that was a part of the Monday morning cooler talk that I felt helped fuel the passion. So many things have been done in sports to shorten the length of games...when I was a kid, I would go hoping for the longest possible game ever. But over time, attention spans have shortened because younger fans today are too distracted to invest in the nuances of the game. And as a result, boredom comes quickly, fans check out, and the leagues are left to create ways to shorten their product. I personally feel they've gone about it the wrong way.
Reducing the number of innings, keeping the clock running when a player is out of bounds, and other measures have removed strategy and watered down the sport. Fact is, most sports games today are LONGER than they were before such measures were implemented. Why? Because we pause 10 times a game for 5 minutes so we can review the previous play. If a replay review could be accomplished in 30 seconds, maybe I'd feel a little differently, but most aren't.
I feel today that we're watching an inferior product. Less plays (action) because the clock is kept running now while keeping the overall length of games the same by adding all of the saved time back on by stopping for replays.