I like how there's a bit of a buffer between unconscious and dying, more so than in previous editions of D&D.

That said, bringing back downed PC's is too effective in 5e, and Larian just cranked that cheese to 11 by making it an action available to anyone and introducing thrown healing potions.

I'm all for both fatigue / cumulative penalties for getting downed AND Medicine checks that only stabilize the dying. And removing the ridiculous potion throwing. Downed PC's should stay down and it should be something to avoid at all costs. Powerful magical healing should be required to bring someone back into the fight.