I think its hard to take so many in-game abilities as completely legit, mainly because a lot of them are used to:
a.) Keep the player alive during an encounter where they shouldn't.
b.) Incapacitate or kill a very large number of NPCs to initiate the next phase of an event.
In an effort to not appear as biased as I am, this includes Jaina. She walks around one shotting people in Dalaran. That doesnt mean I think she can one shot Sylvanas or Thrall. Need to take those leader abilities with a grain of salt.