[detst]

> I also find the opposite very annoying: when fans rate something as 5* before it's even released.

I've received early copies of books with the hope that I would review it early.

But I don't often look at Amazon reviews so I don't know if this would fully account for what you're talking about.

[thalur]

I was thinking of reviews along the lines of "I'm sure this will be great. 5*" I'm not sure if I've seen any like that on Amazon though, now that I think about it.

[PagingCraig]

Tim Ferriss' new book had some 5* reviews go up with people saying they had only read the first 15 pages, etc etc