First of all, Torian is not a tank, he has 2 dps stances - 1 armor penetration and 1 with dots.
Second, Blizz is a decent tank if you gear him properly and keep him in tank stance.
I'm a 50 Merc healer and I have no problems keeping him up and dps-ing (ilum dailies for example).
So you're dpsing, Blizz is tanking and no one heals him ... and you seem to think it's weird; any 40+ mobs hit quite hard in this game, you know...
Skadge is a waste, I tried him, he's worse than Blizz - at least for me (i'm Armormech and i crafted full 49+ absorb/defense gear for him) - if I put Kolto shell on Blizz, he's proccing more shields than Skadge so it absorbs/heals more (often).
All in all, Blizz is awsome, don't give up on him !