I tried playing this champ and it was the most painful experience I think I've ever had.
Why does she have to auto attack at 1/10th the speed? Was locking her out of other roles so important as to make her autos feel like crap? They could at least give her more range like Irelia or Viego. 175? Wtf does she have a massive lance for, show?
Her stun could be good, but the hit box required is so thin, you have to position so perfectly to get it to land - it's like you've already blown your mobility and put yourself in a risky situation to get the stun lined up - and it misses by a hair because somebody actually moved slightly during it....
And her Ult, so powerful but the better it is, the more you've commited suicide. There's no way as a support she's going to be tanky enough to survive even with all her resistance passives and shield (which aren't nearly strong enough, they rely on a lot of scaling - something a support doesn't need as they need power early and need power without items....
It's a shame because this character should be right up my ally. I love tank supports, I really like her whole look, personality, lore, and theme. The champ did really appeal to me. But it's just not worth playing her. There's other options.