The rest of the subclass. Most of the good sunbreaker perks are based around the super being ready or active, so when the super isn't up, the subclass is just meh. That's why classes like bladedancer and nightstalker and sunsingers are so good, they have tons of great abilities with great synergy, and the super is just an added bonus. Bladedancers have blink and blink strike and arcbolt and QuickDraw. Nightstalkers have shadestep and smoke and keen scout. Sunsingers have scorch shield and fire bolts with Viking funeral and touch of flame. Sunbreakers have... Short ranged melee and rather inconsistent sticky grenades? The subclass is based on the super, it's super should be the best.