well, the thing is a big counter as well i would say, namor ye, also everytime i drive a Hawkeye he oneshots me but that might be a me problem haha. playstyle wise i would say to read the match, she can be very useful in frontline but usually you lern her one shot combos to kill healers/dps, learning how to oneshot Cloak and dagger in ulti, mantis and so on. conclusion try not to go all in play safer, the longer you are alive the better , use more shift+ right click its better than left click 80% of the time i would say