Thats genuinely comforting.
But its super important that blizzard dont just chuck a bar at people and say 'see that line at 67%, try stay above it!'. They should perhaps explain their system and set expectations if they want to prevent a riot. Honestly, you seem incredibly reasonable and fair. My worry is genuinely that i cant just pick and choose my moment to engage (as a sin rogue, for whom mass aoe (at level) is a dice roll) and i have to chain pull (chain pulling literally made me hate torghast for a period with those damn dogs that were a mild inconvenience to players in 200ilvl gear, but to my rogue at 160 at the time were a deeps sponge/race against time (my smaller deeps output and their higher health)).
We need much more information on score, the opp cost of degradation, and the absolute cost of deaths. I am happy to agree that tali was at 2-3 stars. I am happy to accept that with 4 deaths he was at zero stars. But i need to know and understand why he was at zero stars so i can strategise appropriately. Feedback (from blizz) would let us know how to improve. No feedback and an arbitrary scoring system where we need to hypothesize a best fit is meaningless. Did i not pull fast enough? Did i die too much? Am i just undergeared? Should i invest in my talents? (obviously you should always invest in your talents? Which ones according to your playstyle?). We need more info than a line in a bar.