Triage seems to suck when used outside of combat, but I love it in fights that could go either way. My experiences with it are wholly anecdotal and perceived, but watching my troops hp regen from red to yellow to green with the medic tapping the seriously wounded guys to keep them from going over the edge makes me happy I took the power. Acid Mortar... I dunno. I have fun with it but don't much notice a difference in fights either way. Not going to ditch it either way, if for no other reason than its another nifty gadget and I enjoy having it for just that reason.
I'm (about 1 box away from) 31 right now and looking forward to all the toys from TU at 32. I might respec, but to drop the Fitness powers I have and either grab Slug or another leadership power. Otherwise Mercs/Traps MM has been a PVE powerhouse for me as well thus far, solo my missions on Vicious and love it.