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Here's BB-Ref's computers' comps:
Travis Hafner (938)
Adrian Gonzalez (932)
Justin Morneau (924)
Ryan Howard (911)
Dick Stuart (897)
Bob Horner (892)
Kevin Mitchell (890)
Glenn Davis (887)
Adam LaRoche (882)
Carlos Pena (869)
I consider anything OVER 900 pretty legit. Mitchell, Horner & Stuart are borderline enough that I'd accept them as well. Other than Gonzalez, I'd say BB-Ref's comps are not quite in the same tier as BP's. Looking at that list, you can start to see where the "Overrated!" chants come from.
Personally, I see Fielder more in the Thome/Vaughn/Big Papi mold -- but all of those guys are taller than Prince. But, well, I'm not a computer...