Why do people only care about SV? Because it's a bit more common than snow cloak? That thing is just as stupid. It's just really annoying not to hit with 100 % accurate moves. :/
More often then not you're pretty much screwed if you need your counter to that Pokemon to even break a sub in the first place (or you just miss). It is always so match-deciding in my battles to miss because of those abilities. >_<
Mamoswine and Gliscor are so threatening with these abilities. I wish Garchomp would be OU again since it's not really too different from these in my opinion (and the metagame has more fast Pokemon too since DPP and very many Pokemon already have ice type moves for the already threatening Dragons so it doesn't seem to me he'd be overpowered).
Miss-stuff is just really stupid in itself.
And it is different from crits, since if you're faster you can still hit your opponent... but to miss with 100% acc moves? There's just nothing you can do except pray. It won't always be happening, but when it does it is really broken.