I think Summoners are fine.

[Thotor]

http://i.imgur.com/1S197gp.jpg

Breakdown from the last one.

~320-330.

~390 from Raging Strikes.

Stop me If I say something wrong.
Using the DPS and total damage, we can conclude the fight lasted 150 seconds
Using the DoT tick you got in game, let's say you do 350 DoT every 3 seconds (they tick every 3 seconds, right ?).
So that's 350 * 50 = 17 500 DoT total.
The parser shows 32 821 DoT Total.

Now if take we replace that DoT total with our theoretical DoT Total , we have :
29216 Total damage on 150 seconds = 194 DPS