I've played highest MMR pve with her and she is weak. I picked her in pvp against Jab and already gave my story in the OTHER 100+ reply thread, I love how we always repeat ourselves just in different places.
She is definitely easier to fight in pvp with when I tried it, because once again: "In video games, mobility is power" which is why I love pvp as Hans, a high mobility character with a sub-par weapon that also sucks in pve but isn't anywhere as strong as R&R due to needing to hit people's feet.