After having played as a pure heavy for the last week, I have come to the realization that there is no reason, at all, to play a heavy.
A heavy is just a free kill to every other body size, except themselves. The current HP and Damage mitigation for the heavy body is laughable at best. I seriously hope SD plans to beef them up a bit, or something. Coming from someone who enjoys playing the support heavy, its just not worth playing. Defending an objective as a heavy is as effective as sitting on your own grenade and waiting for it to explode. A light body type can simply run at you, dead straight, holding down the trigger and kill you, before your HMG pumps out 4 rounds.
This needs to change. Quickly.