Personally, as a Goodreads user I don't care about the review ratings.
I'm there for:
a) making a list of things I want to read
b) finding more books by authors (including upcoming) to add to that list
c) release dates for books on that list (and sorting that list by date)
d) seeing what other people are reading
All of those tasks were time consuming before Goodreads and I'm extremely happy that some let's-refactor-our-website-for-whatever-reason push hasn't broken my use case.
1 and 5 star ratings for unreleased books are dumb but humans are really bad at 5 star rating systems anyway.
I find there's far more value in the number of ratings, but in the end books are often about personal taste.