I honestly don't think there is anything wrong with the sort of overly complimentary work. "Hey, great chapter! absolutely loved the twist where Gavin Luper shot Mr Pikachu. Wow! The description was really good, and the pacing worked well. Revealling DratiniHaunter to be a HaunterDratini was unexpected." etc etc. I mean not all readers are writers themselves, so it is difficult for them to give remarks on what the writer should have done. Furthermore depending on the age, people might enjoy the fic, instead of look at it from a writers point of view, or a professionals point of view.
Example: I love the harry potter books, but couldn't fathom to try and tell her [J.K Rowling] what I thought didn't work; having not ever written something like that, or knowing what she has in store, can I really find anything that was executed badly? Perhaps the time-travelling concept in Book 3...but it was quite clever.