This is definitely something I've learned lately. I'm usually healing with Mercy or Lucio, but if I have a shit team that's all off fighting in their separate corners I'll just go Reaper or Roadhog or something and get some kills. I contribute more and sometimes we actually win.Sometimes if your team is just not cooperating or going off in free for all mode just pick your best hero for killing and go to town. Usually ends a loss streak for me. Gotta be flexible and not just stick to support all the time.