I don't think any one class is underpowered or overpowered. I have all three at twenty six or damn near close, after playing all three in Crucible I can honestly say you'll think every class but yours is overpowered. It's not just the super kills but the melee differences and a combination of Bungie ball drops and player base decisions, like the people who knew VM had no place in PVP yet took it there anywhere. Now in the case of the Hunter's melee being underpowered compared to the others I don't know, I've killed people with the throwing knife but I can't remember if it was a one shot ( or two ) with their shield up or not. Some subclasses need a little tweaking but Titans are pretty boss in pvp. Your special can clear out the entire team with ease, your grenade can cover a lot of ground and do it for a little bit if you have the perk for that. Since Bungie never said each class will have a designated role in the game I don't understand people's rants about Titans crumbling just as fast as the other two classes. Sure it looks like his armor is better but the point to Crucible is to make everyone stand on equal ground in terms of damage done and damage taken. Iron Banner is probably the opposite, I haven't tried it but from what I heard there is no normalization. Your attack is what it is in PVE and the same goes for Armor.