this game is amazing and d.va seems really good i don't know why they are considered UP
Her mech dies easy because its crit spot is giant, and you don't even have to aim for it because it's in the middle of the body
Her ult is near impossible to kill anyone that actually knows what they're doing, because it has a very long rampup time before it actually explodes, and IIRC it has the longest charge of any hero
Damage output is fine though.