Had my first obvious hacker in like 8-10 hours of play. His name was "wwwwwwwwwwww" which, you know going in something is screwy.
Dude played Reaper the entire time and was tracking through walls with no Hanzo or Widowmaker on his team, which, whatever. The real tell was one shot from his shotgun would one shot you. One shotted me as soldier, thought it was odd, then found him as reaper.. one shotted. Then I just started looking for him, one shot every time. Wasn't lag or anything either.
Also, no damage modifiers on him or anything, just solo'ing.
What's great is I mention in team "uh wwwwwwwwww is hackin" and I get the typical NO HE ISN'T BRO, HE'S JUST REALLY GOOD.
Yes, he's so good his weapon is at least 5x more powerful than it should be. /okay