Mercy main here. And, no, you’re absolutely right. With how it worked in OW1, it was a form of skill expression - Not everyone could pull it off, and it was frustrating to deal with, but because Mercy had less control over it, it was balanced by the fact she could only go one direction - Up.
Now, she can jump backwards. She can leap in the direction completely opposite to where she’s moving. And with the lack of ways to knock her out of it, Mercy dominates heroes who can’t reach her. Even Widow’s not that great of a counter anymore, as she’s easier for Mercy to take down and has to be a lot closer to her to guarantee the kill. And that closeness to the enemy team means Mercy can more easily take 5 seconds to loaf a clip into your head and fly off back to her team.
And the way they’ve tried to balance it, by increasing GA’s cooldown on use of one of these techs doesn’t do too much either, as it simply doesn’t work in Valkyrie. I don’t know if this is a bug or intentional, but that’s just what happens - Guardian Angel always has a 1.5 second cooldown during Valkyrie.
So, just revert Guardian Angel to how it was in OW1