The MMR in a way does what your proposing for the reverse passive effect. I dont think simply getting gunned down is the problem alone.
Not using common sense like;
* seeing an ally about to explode and you stay there wondering if there going to evolve.
* Being oblivious at the fact that the bomb your carrying to the tanks will kill you too while you shoot at it in point blank range,
* Seeing a red outlined player and thinking that spamming grapples will solve everything.
* Seeing a horde approaching and thinking your boss enough to tank all there shots.
* and finally ....not realizing you have powers/abilities in the first place.
Its not the lack of passive assistance that's killing them, its either that there not playing using common sense or there thinking since this game is free that there going to get a cheap game that doesn't force you to play smart.