Writing quality: 2 stars - Just read the synopsis and you will understand. Grammer is abyssmal and reading becomes more painful than it should be.
Stability of updates: 3 stars - look at chapter list to see update frequency, its sporattic. sometimes with a gap of a day, other times with a gap of 2 weeks.
Story dev: 3 stars - idea is interesting, execution not so much. Author has a good imagination, but not the best literary skill.
Character design/world backgroud: 2 star - hard to understand and not really built up. 2 stars becasue its a fanfic and people have a frame of reference from canon. Otherwise, not much is built up here.
Overall: 2.4 - not recommended for someone new. Only if you are a literary masochist who is used to terrible grammer and botched writing.