Sun breakers 5-7 shots are far less accurate- tracking is also super low, almost unnoticeably so. Plus you lose some decent perks to take it. In addition, hammers have travel time, and can easily be out played by a person who doesn't just stand around. Blade dancers are still very potent and powerful, and are far more mobile than sunbreakers. Gunslingers have far more offensive capability. Seems pretty balanced to me.