Sunbreaker is one of the strongest classes in PvP. Cauterize is fantastic for the neutral game. You can basically titan skate into a crowd of enemies, throw a fusion grenade (one of the best grenades in the game), get behind cover, and be full health to engage more enemies. And cauterize also helps the melee attack become viable (although still not great). The super is VERY strong. It's rare that I get fewer than 3 kills, and I regularly get 4 or 5 (sometimes even 6) kills with it in PvP. You just need to predict how the enemy will move - sometimes you need to wait for the enemy player to jump first and then throw your hammer. When TTK launched, Sunbreakers were horribly broken. The super was ridiculous. I still think it's just a bit overpowered, but I would prefer changes to other classes to make up for it.