Book Marks will showcase critics from the most important and active outlets of literary journalism in America, aggregating reviews from over 70 sources—newspapers, magazines, and websites—and averaging them into a letter grade, as well as linking back to their source. Each book’s cumulative grade functions as both a general critical assessment, and, more significantly, as an introduction to a range of voices.
Source: Introducing Book Marks, Lit Hub’s “Rotten Tomatoes” for Books | Literary Hub
I’m still checking this out. Let us know what you think about this new service in the comments.