I thought she was ridiculously OP the first few rounds i played as her, but she's really squishy and easy to over-extend if you're not getting heals. I really like how good her abilities are for rushing down lone enemies and GTFOing
At first, I thought she was OP, but with some more time of play, she can be actually easy to counter if the healers don't back you up. It's like a genji with wings, but her ult is really cool to use.
It has a lot of mobility, a good spam damage that is scary, but it is also easily counted by an ashe or some hitscan, but well played, it is difficult to kill. Not counting his ultimate, he can roll 3 shatters!