For me the first thing that comes to mind is Tales from Earthsea. I don't think it's excellent or anything and has plenty of problems but people act like it killed their dog. While it has its problems that have been covered extensively, I think it has a beautiful atmosphere and art.
IMO it would have been better received if it wasn't advertised as an Earthsea adaptation and was just its own thing.
Exactly the same, I still love Tales of Earthsea. It has its issues compared to the book, but it's still great. My conspiracy theory is that it's a plot by Hayao Miyazaki fans to discredit his son since the father didn't like it.
I really liked Under Ninja recently. Everyone's been shitting on the adaptation because it looks weird, telling to read the manga, but the manga is just as weird. The adaptation is really keeping the same vibe.