User blog comment:Deshiba/No counterplay/@comment-24191093-20140515185622

I agree that Vi's ignoring CC is strong, but I don't think it's overpowered, and her ultimate would be substantially weaker if she didn't have it. Since the dash is fairly slow and she can't cancel it once she starts, it would be very easy for enemies to stun her out of it if she wasn't immune. However, she still has counterplay, since as an enemy you know exactly where she's going to end up from the moment she starts the dash, so snares or stuns right after the dash ends can leave her stuck in the middle of the enemy team.

IMO, Poppy's ultimate is far stronger. It lasts longer, makes her immune to damage as well as CC, and she can freely move while using it.