But players never pick what the team needs, everybody pick Widow or Hanzo, climb to rooftops and play their own version of team deathmatch, completely ignoring objectives.
Pick D.Va.
Point mouse at solo scrub.
Boost towards them.
If they shoot at you, activate defense matrix.
Congrats, you're now in their face and ready to mow them down. Point blank, you can trade favourably against anyone but a reinhardt. Be sure to boost back out afterwards if you're taking fire.
Works vs bastions too, although you may lose your mech in the process and finish him off on foot.