Not strictly true, if you suck at Heavy (as I do), you actually repel medics away from you

You're a good heavy, I said you should play it more, if just to stop you from sniping me

While I'm on underrated heavies, Ams, Cruel, Zarf and Marenghi are all excellent (among others, but they're just 4 who don't primary it).
I'm finding Ams, Power, Zarf, Papafade, Cruel and Marenghi all very deadly fatty opponents.
Ams has the edge on ambush ability - he does some unpredictable things. With heavy, half the fight is getting the first shots in. Ams is good at getting you to follow him after he runs, then he turns first to ambush (yes, I think I've figured him out just a little bit). You ex-spy playing heavies should have the edge on being devious.
People I want to see play heavy:
1) Any excellent sniper (like Mama).. then I can go sniper for some payback

2) Claws
3) Cheez... (I want this so much, so I can demo him into oblivion)