I tend to rate things only if I like them, if I don't have a rating for an anime it just means that I wasn't impressed that well.
5- Enjoyed and kept me focused
4.5- Pretty good
4- Storyline lacks something to put it up that extra star whether it would be character dev., storyline, etc.
3.5- Pretty good but has something about it I'm not fond of
anything below these scores - I dislike a large form of the anime so I'm only gonna rate it because I clearly dislike it.
Other than that most of my reviews will be leaning towards the higher end.