Cloak of Shadow - how is it balanced?

First off posting on my main, I've got the balls to ask and not try and troll the hell out of people..

How is this skill balanced if a rogue has immunity to all spells and slows how can I stop him hitting the hell out of me till I'm dead?

I genuinely would like to know wtf I can do against a rogue who spams that whenever his cooldown is up, and don't say I can HoT and fear because with stun when we HoT that isn't an option.

http://forums.wow-europe.com/board.html?forumId=10016&sid=1 - read before you post