here’s my issue with d.va since all zero people asked.
it’s not that she is the only off tank that contest high ground, and it’s not that she is the most effective off tank at actually spot tanking. it’s that she’s both of these at the same time while having burst damage to rival roadhog. she’s not overbearing by herself but ridiculously universally applicable, and the only realistic choice if the map has any semblance of high ground.
a large critbox is not a sufficient trade off for this, especially since this a characteristic of the tank class and not a specific slight on her. there are tanks with both larger critboxes and worse positioned ones. being unable to be crit when DMing or when she’s not facing you does a lot for her survivability. roadhog for instance is far easier to poke at range since he has no armor, no mitigation ability and can’t do anything to you outside of hook range. and even if you are you can just rush him once he uses hook and he donates 600-900 HP of ult charge without being able to escape or kill you in time.