I don't like playing heavy because 7/10 times I get backstabbed within 12 seconds (yes, even if I've been looking around). As for medics, I like em (as long as they're mine, if they're not... all my hate), and I can typically play them fine. I get stabbed alot less often then I somehow get abandoned in a small tunnel with a <pyro/soldier/heavy/what have you> and often end up saving my heal target's backside from getting an additional hole if I do have a pocket I'm healing. It's just kind of amazing how often people do not check their backs (unless you're a spy and really want them dead, in which case, they're Satori/Koishi(AKA; they know you're there) and you're just about to walk right into a very quick death).