The friend i run warzones with sits at 300-600k every single match. Most of the time its ~450k, he plays a dps Sage. He averages on 100k + healing, most of it going onto me or other players.
I sit at 150-300k every single match. Most of the time its ~230k, i play a tank Vanguard. I average on 75k absorb. Most of it through guard and taunt on focused friendlies.
We play the objectives allthetime.
While dmg/healing done is highly dependant on the match length, if you dont break 200k as a pure dps not guarding a node the whole match you are doing it wrong. I cannot comprehend why noone ever outdmgs my friend or why i end up 2nd in dmg and 1st in absorbs in 8/10 matches while playing the objective and doing single target dps.
If you want to improve, visit your class forums and hotkey stuff.