on my server seems every other team seem to use around the 400s
elric high health means jack when he's take 10k per hit or 30k from my osiris
The exact same thing can be said about every single tank in the game. With the exception of Petros 6-7* who can withstand a lot of pain. And Orkon is surprisingly tanky considering he is a DPS, if the takes a lot of small hits, instead of a few super big hits, he will live a long time
mirielle a tank? how
When fully maxed, 7*, academy, forge, runes, she is an oustanding tank (compared to other heroes with the same upgrades). And deals respectable damage too. IMO when comparing fully maxed heroes she is the most durable tank after petros (maybe after the improved driller), if you compare her to Goram for example, Goram will be instakilled by a super strong magic combo opening attack if he is denied his illusions, Mirielle probably won't even get below 50%.
Octo will be up there if he lives long enough to use his ulti for a while, but at the beginning he is susceptible to burst, especially from magic.
Driller with awakening+skin is a beast of tank. He can take more hits than Petros depending on what is hitting him (Cara's ult will take him down for example). I have had a match where I had 4 heroes beating on driller (alone) for over 30 seconds and the match timed out...