Yep. Blizz seems to be dying very often unless you keep his equip up to date. I've played my BH as Bodyguard up to 50 beyond 1.2, nevertheless I had often trouble keeping blizz alive, cause the damage he has taken was insane and his damage output on the other hand has been freaking low. I've got blizz at this time up to date with lots of equip from commendations, and still it was not that i had expecte... It's sad, that the BH gets his "tank" Companions at early Endgame and then they were a bit of useless...
This was one reason i respec'd to arsenal and get Mako up to date... She never gets overheatet, though her heals seems to be lowered post 1.2...