I get 2 medals right away in warzones by guarding low-levels and protecting them (usually end around 90-100k of protection per round). The rest of the game you need to actually play hard if you want 11 medals, regardless of exploiting the two possible ones.
I do agree that this acid exploit isn't acceptable, but I don't think there's anything we can do for it (unless they make the acid area a non-heal area).
But yeah, for sure...don't like seeing this happen. But in the long run, it's just medals man. You'll be ok