Review Opinions

I'm curious as to how you like instructional video & books reviews done.

The reviewer's opinion will always be a part of the review, but do you like the reviewer to go as far as rating the material? Like "4 out of 5 stars", kind of thing.

Or do you prefer the reviewer to give the basic layout & some information about the product and let the reader decide more for themselves? More of a detached review w/o the personal ratings?