Valkyrie is a tad too much
It always puzzled me how Valkyrie's kit is just too great all crossed the board when compared to the other legends.
She has a mobility passive that is more like a tactical than a passive compare to other mobility passive. Her tactical does damages and stuns people, which she can activates whilst barrelling down on people which prevents them to move or evade or anything. She has a great ultimate to move around. On top of that she can scan people whislt flying [even inside building if not mistaking] and scan the beacon.
Either up the other legends or lower some of her features (ex: remove the stun effect of her tactical, no scanning if no line of sight, move her to skirmisher [she has more mobility than all of them combined]).
