Shit man, the heavy. The only thing I like about the heavy is his personality and cosmetics. Other than that, he's a fat guy with an insane amount of health and a minigun that can obliterate several players within mere seconds. Only things that could really put down a heavy effectively is a spy or a sniper with charge enough to do 300+ damage cause medics cradle heavies like diapers, other than that, unless the heavy is retarded, he'll acknowledge the first hit and find his new victim or retreat. Even with engineer, it takes time to slap a level 3 sentry gun so it shouldn't be something to complain about but there's no time for a heavy to slaughter again, not to mention he's mobile unlike a sentry. Tell me again why TF2 labels the heavy in the defense section with the Demoman and Engineer?
As for the 10th class, Mrs. Pauling or however you spell it.