Critical damage is poor compared to other snipers. Main reason why I don't use them other than to it's occasionally fun to shoot them.. That and two ammo per shot for a sniper rifle. --- They're not going to say no because of the implication.
Only E-tech shotgun ive ever seen worth a damn was a E-Tech Bandit shotgun, 3 round shot and fire element. Tears through flesh like a hot knife through butter. Hyperion E-tech shotguns are just...meh. I do have a Practible (w/e) CC with shock that does some decent work.
Vladof Blasters are amazing, I have a shock one I absolutely love and Plasma Casters are amazing, haven't found one I did not like.
Dahl Blasters are good but only vs bosses and large groups of enemies.
The Veruc is awesome, still looking for a shock version for my Mechro