Kitty Kelly's "Bush Dynasty"...

Just reading through a non-Bush approved biography. In fact it's my first. Has anyone read it?
I know it has an anti-Bush bias, but what validity is there to the many of claims about GW's (and the family's) past re: Yale, Skull and Bones, Cocaine, Impaired driving, racism, aristocracy over meritocracy, sub-standard academics etc?

I'd like a balanced perspective, but don't feel that I'd get it from a Bush authorized bio.