U can play heavy on different ways, just depends which way u pick. Being blaster or tank who is not capping is most pathetic thing ever. Also, even as someone who likes Tank (since I like tanky classes, not just in FFT), I agree that he is op and some things should be changed (just my own opinion on it).
Far more annoying for me is assassin and scout. Assassins panic bomb is pure cancer and I really had enough of stacking bombs on me. 'oh that gunner survived, lemme throw 2 more bombs, then ill pick another 3 and throw 3 more just to be sure'