You can blame Donald J Trump for all it matters, it makes little difference who's at fault or whatnot in my eyes. My energy is better spent melting those trash packs than pointing the finger at the rest of the group.
Even in a very decent ~17 minute run, my DPS will have saved around 5 minutes.
Agreed, I'm pretty consistent with DPS in dungeons and see the same as you, I'll frequently get 2 or 3 commendations, sometimes I get none. Not everyone can be bothered dishing them out.