I follow a my own rating system to give the scores more meaning to me personally below is a few things I consider when rating and other things.
I will rate anime on the following :
Story - did i like it and was it entertaining to me did it keep me immersed.
Emotional Impact - did the anime make me laugh , cry , angry and care about what was happening.
Characters - do i like any of the characters or all of them or just a select few
Animation - was the anime handled well , does it have good or bad animation and how did it impact my enjoyment and watching Experience.
Visuals - Did i like the series Character Art and the aesthetic of scenery
Note: Adaptions of Manga and LN will be judged and scored by examining both the anime adaption and source material with how the following are handled Pacing,Changes,Cut content and the Animation and if i enjoyed it or not, I will view movies the same way as they are singular and have a limited runtime compared to a series depending on how-many episodes it has and will keep in mind that only certain amount of content can fit into one, overall movies will be rated on characters,story,themes,animation and as well as pacing.
*Not all shows I drop will be because I don't like it,
*** Depending on the anime i will compare it to anime's of the same type and score it based on what series i enjoyed more or if I think they are weaker compared to others
(Notice) I like and don't mind Ecchi shows ( depends on the series) so if they are rated higher then you would score them then sorry i also find it funny that a lot of people complain that a series is too Ecchi despite it having a Ecchi tag and their over the top reactions to it lol and i also don't get bothered by the humour in a lot of battle shonen shows or other shonen shows in general.
Manga's will be mainly rated on Art and Pacing, Characters, story and ending and my overall enjoyment same with light novel's but illustrations instead of art.
I own Physically a lot of the manga and Light Novels i am currently reading or have finished reading but a few maybe an exception due to lack of availability Physically or Digitally.