"how good were Dorian Yates genetics?"
It depends on how you define "good genetics". IMHO good genetics are classifeid by the overall shape of the package. Not by how much mass you can slap onto a frame. It should also look somewhat functional, and atheletic.
I like Shawn Ray, Ken Wheeler, Frank Zane, Darrem Charles, ect. These newer guys are just power lifters who masquerade as body builders. MOST looks like Anthony Clark for the better part of the year.