BUT - I DO think the best is when the style is EXACTLY the same as the anime or manga- (obviously dosnt apply to origional works).
Lets face it- if you are making a doujin of a show- that means its because you like that anime/manga- its style and/or characters, and want to have them do stuff they cant in the origionals (since they have to go on TV or sell to a wider audience).
Even though we're talking about opinions, I don't really get that. If you're going to make a doujin, and draw it and everything, I don't get why you'd make it look exactly like the anime/manga - if I wanted to see the official style, I'd go and watch/read the source material. Same thing with fanart. You're reading the doujin to see someone else's personal take on it, and if the personal take is just basically them regurgitating the source material with a twist for "wish fulfillment" then what's the point? So long as the art is good, the story is enjoyable, and the characters are intact, there's not really a reason to practically copy/paste the original anime. It's kind of demeaning to the doujin artist to say "We don't care what your personal take on ___ is, just make it look like the original and it's pretty much great".
That aside, this guy's art is slightly creepy (probably just the wonky facial proportions) so I get the dislike towards the art, at least. Futa's definitely alright in my book, and it's been added in "needlessly" in other doujins, so that was alright. The characters just felt a little off, and it isn't a great doujin overall. But some people out there might like it, so kudos to them.