Question for Readers

When choosing a new book to read, do you read the reviews? Amazon seems to have the most prolific reviews and a lot of authors depend on them.

As a reader, which type of review do you prefer?

One that summarizes the entire book?

Or one that is more along the lines of "I liked it, and here's why"?

I know what my preference is, which is reflected in the reviews I've left. I do try to leave a review for 90% of the books I read - either on Goodreads or Amazon (usually both) - as an author I know how important they are.

I am interested - which type of review do you prefer and why?