Kinda like Garen spinning away, or Tryndamere spinning away, or Jax jumping away, or Kah'zix jumping away, or Rengar jumping away, or Fiora with her Burst of Speed, or Vi dashing away, or Irelia dashing away, or Jarvan IV dashing away, or Jayce gaining speed to run away, or Kayle gaining speed to run away, or Lee Sin flying away... I can go on and on here. Sion as it is waddles away.
And AP Sion is a gimmick. He looses out on an ult, and gaining a bunch of perma life. Not to mention the atk bonus is wasted since the build doesn't focus on attack speed, and his normal attacks are one of the slowest I've ever seen.
And what's wrong w/ being able to close distance on a melee only champ? So many others get a tool set for it.
I really don't see why this champ needs to be so vulnerable.