Last week, fresh 80, I went 3-7. The 3 was for teams that didn't show up. Tonight I went 2-8. One team didn't show and the other win only 3 zoned in. 6 of my losses this week looked like this:

Bladestorming machine of death, mayhem and destruction 50-60K damage.
Other misc dps 10-20K damage.
My 5x shaman 15-20K damage each.

I usually manage to drop 1 but that warrior just charges in and destroys my team.

But yeah < 300 resilience, < 2K spell power...gimme more time and...I will survive!
I'll probably recruit a healer at some point to be honest.