It makes sense that she can take out Pharah's ultimate, but other heroes can just bypass it. Reaper comes up behind and uses his ultimate. Sure D'va can turn around and use her shield, but that just opens her up to the enemy. Prone to being hooked, charged, etc.
I can agree that D'va may seem imbalanced, but she is squishy compared to the other tanks. The shield justifies her squishyness. Also her health pool is 500hp total. 150 base health, 350 armor.
D.Va is like the worst tank. Her headshot hitbox is in the center of her body, so even if you aim for it and miss you'll still be hitting her, plus her ulti is incredibly easy to predict and dodge.
