Apologies if this quote fails
@Mopman43 , but Night's Dark Masters says;
Unquestioningly loyal. Infallibly brave. The pinnacle of the necromantic arts. If I had a hundred such as them, I could conquer any nation, rout any army - and never lack for camaraderie either. Although, they are typically poor conversationalists.
…
Here is necromancy at its peak—a creature with the dark will of the Spectre combined with the bodily strength and unflagging discipline of the Skeleton. Though their flesh may rot, their bones remain strong, and their minds retain their mastery of the art of combat and their lust for slaughter. As the Skeleton is to the Empire's foot soldiers, the Wight is to its great generals and heroes.
Remember that tabletop stats are balanced. Wights could individually be the equals of human heroes in fluff, but be blacked down on the tabletop.
Edit: It's not the quote I'm looking for, but pages 63 and 64 of Liber Necris have the most details about wight creation I know of.