I rate animes based on how much I enjoyed them. Aspects such as animation, characters, audio, etc. mean nothing if I didn't enjoy it overall. By far, what I care about most is the plot. Also, I tend to research animes before watching them, as to avoid turds. Once upon a time I went and saw a movie called Dream House in theaters -- This taught me the importance of reviews. However, the side-effect of this is that most of my ratings will always be above the 8/10 threshold.