Granted, when somebody has a really good feel for their class, they tend to be nightmares to play against because all pretenses of fun are thrown out the window when you are headshot/backstabbed/puff and stung for the millionth time. But the difference between every other class and the Heavy is that pretty much ANYONE can become an asspain with the Heavy because his learning curve is non-existent. Then you factor in that his secondary and melee unlocks exist solely to make his rampage last longer, come sooner, or go Juggernaut on you and shrug off any non-melee attack thrown at him.
Play spy. Or sniper. Or medic pocketing one of your own heavies. Or pyro w/ axtinguisher.
The difference between beginner heavies and expert heavies will become clear very, very fast.
16v16 pub
That's your problem. The game is designed for 12v12. Valve can't balance the game at every player count >_>
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Oh, a big machine with flashy lights. A big machine like that has me written all over it. Well, okay, it doesn't. But give me time... and a crayon --11th Doctor