The only way to counter a sunbreaker without wasting a super is to go with 3! people after him aka snipe him. So it' basically best to use a Sunbreaker yourself. I am always around +0.5 K/D better with a sunbreaker, which means he is op.
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Easiest way gives more % to succes. And maby its harder to 3 snipe him as to "waste" a super. I Dont think you waste a super to counter a opp super. He can get 3 kills easy if you Dont run. And running is a good strat, but you will be scattered across the map. At that moment u need good 1 vs 1 or 1 vs 2 players. Not all people are good at that.