I really like the transformation aspect of her ult, I like the way it builds up. And I like it's not another always on form switch like Elise/Jayce/Nidalee that forces you to worry about 8 abilities. But the current bonuses during ult don't feel very satisfying.
Twin bite hitting all targets in a cone, Sounds awesome on paper, but how many clumped dragon Qs are you actually getting? And how many of those are just going to apply wits end and devourer or Botrk twice, just like your non ult form does, and then force you to go back to doing what you've been doing, mindlessly autoattack. Your abilities just don't feel like they matter in dragon form, Fire breath just serves as a means to add more shred damage for your double procs, while Fire spin is just a gapcloser and damage you'll never itemize for because your role doesn't allow for it. If anything, Dragon form firebreath should be an area slow or stun on hit instead of the same thing as usual but wider area. Give us some big fun spells to use like Gnar has.