I use Goodreads weird (bear with me, this is going somewhere, eventually). I like the site as a way of tracking my reading... and that's it. I don't use it to track 'want to reads', I don't use it to discover new books, and I never, ever use it to share reviews.
And to double-weird it: I don't rate books. Except, as a visual shorthand, if I think 'this book is interesting, and I'd like to talk about it', I'll slap five stars on it. That makes it easy to sort, and leaps out when it is buried in a long list. If someone misconstrues that as an endorsement of perfection... eh... no harm done.
ANYWAY, this is all really interesting - or at least, relevant - because that has always been the way I use the site. There is, however, one notable exception: comics. For some reason, my 'five stars' for a comic book is a lot less complicated. I read a ton of comic book collections. And I stick five stars on the stuff that is really good. You know, kind of like the rest of the world uses Goodreads. Go figure. All my deeply-rooted biases against 'objective' reviewing come crashing to a halt.