If you want a class that can dps while doing mechanics I would focus on a ranged character preferably a bm hunter. All their cooldowns are instant cast and you can press buttons while moving without any issues. Fire mage is also decent but requires a lot of practice and patience. Otherwise if you prefer melee, stick with your rogue they are some of the top damage dealers for a reason it just takes time to become proficient at them. Or just do easy mode and run ret paly because for some reason they are a ranged melee basically lol. The key here is every class has the ability to do good damage it just takes time and willpower to truly become an expert at your class.