#Bookish opinions:
Things that should always be on the cover, but often aren't:
The translator
The cover artist
The cover designer
A blurb that doesn't contain spoilers
A list of awards--on the back
Things that should NOT be on covers, but often are:
"Stickers" that are printed on, not removable
Quotes that tell you nothing about the book or why the person quoted "loved it!"
Spoilery blurbs
I'm with you on that.
The one of these that bothers me most is when the name of the translator isn't on the front cover.