I like the overtime rules the way they are...I know I'm in the minority.
The way I see it is, the teams got 4 quarters to establish a winner. They failed to do so. Since they're so evenly matched, the coin flip introduces some randomness to it. I get irritated when I see the "we deserved to see Aaron Rodgers (or whoever) try to score it OT" line. Why does he deserve an extra chance when he failed to win in regulation? He only deserves it if his defense prevents the other team from scoring. We don't need multiple overtime periods because the teams keep going back and forth in a playoff game.
Now, I can see ditching field goals in OT. It DOES seem unfair to me that teams can stop their opponent once, and get the ball after a punt and only have to move 20-30 yards to be in FG range to win it. Let's require a TD, but keep the rest the way it is.