There's nothing unique about her at all.
'Angel' heals people, almost exclusively. Revives them when they die. How is it anything more than boring?
I'll take roller skating DJ who can wall ride, push people off the map, do decent damage, contest for long amounts of time, speed boost, oh and also heal. And a robot monk who heals, can melt targets, claps his hands to reload, and floats, anyday.
Just because you find her boring doesn't mean everyone else does. Yeah she might not have a kit like Zen or Lucio but I still have fun with her regardless.