Counter picks only work if they're playing to actually counter you. If your team has a Genji and the enemy team has a Winston, that doesn't mean that the enemy team wins if the Winston isn't so far up your Genji's ass that you hear Genji screaming peanut butter in Japanese. For Tracer in lower ranks though, just pick off the healers first and work on Blink management. You don't need blinks to dodge everything, a bit of crouching and jumping around is enough most of the time. Save your blinks for when you really really need them.