5 roses: Phenomenal, one of the best books ever, incredible, can't find anything wrong with it. Probably the only one I've encountered would be Harry Potter, but I'm gonna keep looking anyways.
4 ½ roses: Really, really, really great, almost perfect, but not quite, and still a hard rating to get.
4 roses: Very good, top-notch, loved it. This is normally the highest rating I'll give.
3 ½ roses: Still quite good, I'd recommend it, and probably read it again, but there were some things I didn't like.
3 roses: Decent, not the best, but not the worst. There were probably somethings that bugged me but I still like it.
2 ½ roses: I wouldn't read it again, but it wasn't terrible. I probably had some issues.
2 roses: Not something I'd read again and I probably had a lot of problems with it.
1 ½ roses: Why did I read this?
1 rose: I probably flung it across the room in frustration at some point. Not very good at all.
½ rose: Not even worth the paper it's written on.
O roses: I could see burning this.
I am trying to rely less on my (currently still new) rating system and be more descriptive in why I gave it that rating, but it's a bit of a process. Feel free to leave a comment about any rating I give a book.