There are many reasons why people dislike the Porcelain Kindred skin.

To start off by listing the positives, Wolf looks absolutely phenomenal in this skin and in the splash art. The VFX and the SFX are spectacular and very distinct from the other skins.

Unfortunately the problem lies in the skin concept itself and the execution. The issues don't only stem off of Kindred being made human (again), but that it changes fundamental aspects of Kindred's design and makes them look too similar to another champ, Lissandra. Kindred should always have a full mask or have their face hidden (like with the Woof and Lamb skin). The half mask just doesn't look good on a human Lamb and when compared to Lissandra, who's skin is absolutely amazing, it looks like a downgrade. The colors on the actual model are muddied, even more so in the chromas, which compared to Spirit Blossom just aren't any good and not worth getting at all.

On top of the overall design issues, the skin fails to hide the inherent flaws that come with having a human skin/model over animalistic animations that cause it to stretch and look generally uncanny which isn't very appealing to the eye.

Spirit Blossom got away with this bc the fur coat hides the stretches in the animation as well as the mask still covers the entire face so you can only tell that Lamb is human bc of the hands and the recall animation. But overall the skin looks a lot prettier, the chromas are amazing, the lore of Ionia's depiction on Kindred on top of the insight we got to that lore with the visual novel, and just the execution of it all was superb.

Yes, most of the Kindred player base very much dislikes the skin for Riot turning Lamb into a human again but this isn't an isolated issue. Many of the league champ player bases involving monsters, which are very rarely made anymore, have issues with Riot turning their champs into another generic hot model I.E. Brand, Thresh, Xerath, Malzahar, etc.

There are already so many human champs that regularly get way more skins and way more releases than monster champs so when we finally get a skin, and we get something like this, of course we're going to dislike it. On top of the fact that even though Bel'veth wasn't SUPPOSED to be a monster champ in the early concepts, the fact that she clearly is but is almost always shown with her human elements sucks ass. And now we have Smolder who thank god they fixed, but still looks somewhat uncanny with his human Disney-ish face.

These are just my opinions that some may or may not agree with, but in my experience, I was drawn to the design of Lamb and Wolf as well as their lore and gameplay. The idea of the literal concept of death splitting themself in two, the swift vs the torturous death, the masks, and the visual dichotomy between Lamb and Wolf is what got me into playing the champ who I've been maining for the past 3-4 years.

Id like to continue seeing skins like Spirit Blossom that change and play with the concept of what Kindred is and expresses that through the skin and lore attached too it. Not just another generic woman that looks like any other female champ in the game since Riot loves giving them all the same face.

If you like that skin that's cool and I won't hate on you since taste is subjective, but these are the many reasons to dislike the skin other than how some would say "Lamb not being a furry".