Something doesn't have to be broken or OP to need changing. As it is, every Pokemon is evalutated on whether it's weak to Rock. Anything that's weak to Rock, people will tell you "its Stealth Rock weakness is a downside." I daresay some Pokes are on lower tiers than they would be if SR didn't exist.
This is pretty much end of discussion right here. A single move ruining so many Pokemon's capabilities is ridiculous. Stealth Rock is the single most influential move in the entire metagame.
Well you have to think about it. It makes sash a lot less useful and forces a lot of them to be leads rather then late game sweepers.
It damages a large chunk of threats and forces focus band users to stay in. --- Gamefaqs in a nutshell (http://error1355.com/img/gif/gamefaqscant.gif)