Rolling Warlock?

I had a level 55 lock on my old WoW account before I rerolled DK to 80. Was very boring levelling but dominated in PvP. Just wanting to know what they are like in PvE and in PvP at 80?

 

Locks fully pve can top dps over hunters and rogue, PvP they have pro damage over time so id say do it.

 

Locks are always needed in raids. Who doesn't want
free healthstones and summons inside the raid?

 

They're pretty much the same in regard to level from 1-60; difficult and boring.

However, after 60, I'd say they're good fun, and the destruction tree is viable (ecven for leveling) and fun for PVP/raiding also.