User blog comment:DoctorAsawa/Vin - The Living Barricade/@comment-5266525-20121125191338

I can foresee big problems with sustain on Vin. Despite his abilities costing large chunks of his current health (you should clarify the cost tooltip btw, check Mundo and Vladimir's ability pages for how to properly word it) and his passive slashing that in half, he has no way of getting that health back. He's going to have enormous difficulty keeping his health at an acceptable level (ie. without getting blown up in one autoattack). Considering he's a melee support, this is a very big deal.

His ult is too strong. A global hard CC combined with a global Cleanse is insane. Also, you cite bonus attack damage in the rank list, but you've not said anything about increasing anyone's AD.