Sunbreakers have equal defence as a Radiance Sunsinger, their hammer is literally a nova bomb that you can throw constantly, they can survive a single Golden Gun shot, they can survive a final round sniper headshot, they can get their health back from a super kill. That is OP, I don't care what you say to defend it, because there is no good justification for something that powerful in the game. Supers are meant to be able to counter each other, and every super currently minus the Sunbreaker can be countered in multiple ways. Sunbreakers have no inherent weakness. The argument that "oh we didn't have a good class for year one, so it's justified" is a shit argument, infact it's not even an argument since it's based on -blam!- all other than you being shit at the subclasses from year 1. Striker Titans could survive golden gun shots, have powerful grenades and demolished Bladedancers and Sunsingers. Bubble Titans had their weapons of light which allowed snipers to single shot people, even Voidwalkers midsuper. Although Defenders were bugged by razors edge from being able to travel into the bubble which was annoying. If Sunbreakers had their health regen removed entirely, and maybe have their super use limited to something like Golden Gun where you can only use it 3-4 times it'd be balanced. But as it is now, it's the best class to use for PvP by far.