Mannoroth's Fury never was that strong.
Archimonde's Darkness grants an extra Dark Soul per fight. That's hardly OP and is actually beaten by KJC because of the damage you lose while moving otherwise.
Doom worked fine, it's the addition of UVLS that screwed it up.
Chaos Bolt is SUPPOSED to hit hard because of it's resource cost. That's the whole point of the spec.
Incinerate hits for 160k in top Destro logs. Calm your tits
Shadowburn would make no sense with both a cooldown AND a resource cost. It's either or.
Destro doesn't need any mechanical changes, just some a few nerfs here and there.
Now, I would like to mention that outright bitching and whining about other classes is incredibly counter productive. Your time would be better spent thinking of ways to make Shadow better.