Here's what I'm working from. The lowest ranks are around mostly because teenager who photoshopped my marbles did a whole suite, not because I expect to use them. ACKs will probably be DNF and you're unlikely to hear about it. I am drawn to trainwrecks, though, so it could happen.
A three marble review isn't a bad review. It's "I liked it." May not have gotten excited about it, but there was something to like there, and I did. Fives rock my socks all the way off. Editing is not what I'm looking at most, but a lot of goobers may cost half a marble, because it detracts from the reading experience. I have the world's fussiest beta and it's rubbing off.
|Really liked this|
|Liked this a lot|
|Didn't work for me|
|Really didn't work for me|
The online behavior of authors will influence a review, but mostly because they won't get reviewed. I won't knowingly spend money on someone who flips out on the readers. If my baser instincts get loose I might laugh and point, though.
Crossposting to Goodreads is a problem, because it's whole numbers only over there. Rounding up or down is going to have to be a judgment call, and if the number isn't round over here, I'll note it there.
This is all still evolving for me -- changes will get announced.