Although it is not super obvious you begin to notice that some parts are vastly different than other parts of this story.
The author copied many ideas, phrases, sentences and whole story points from other fanfics. It is a work of theft which I can only rate 1/5. It should not even be allowed here. The only reason it is allowed is because he stole from so many works and twisted those idea together into a friggin monster, making it somewhat a original.
Anyway. I can't tolerate this at all. If you have ideas, write a story. Don't steal the good parts of other stories and just change the names....