Generally never write reviews myself. It does give me a chance to express something I've been thinking.

I have been going through all the books that have been uploaded here, in an A to Z (still on F) fashion, and have reached two conclusions about the value added by this site [as a book source] versus just going to Project Gutenberg; the source for almost all the books here;

Sometimes value has been added through significant modification of the source material, e.g. illustrations, or significant improvement to formatting.

Even when little more has been done than stripping out the P.G. legal stuff, maybe slapping on a cover image, and file format conversion, often the person doing the upload provides valuable comments (a review of sorts) about why the book might be of interest to me.

In other cases when all that is said is what was copied from, say Wikipedia or Amazon, then not so much value added.