The Klitschkos vs Valuev - what would've happened?

Despite being seen as a bit of a freak show and mostly relying on his size to win fights, Nikolay Valuev wasn't that bad and it's a shame one of these fights was never made.

Vitali was inactive/retired/'champion in recess' around the time where Valuev was probably at his best so I guess that fight was always unlikely to happen but had it not been for promotional differences then a Wladimir Klitschko vs Valuev fight might have been made.

How do you feel each of the Klitschko brothers would've fared against the man mountain? Are you disappointed neither ever took place?