Most of Irelia's skins feel like they're missing the 'flow' the base skin has, especially Frostblade
The base skin's blades move in this absolutely GORGEOUS flow(seriously you knocked it out of the park with that, i could look at that all day), but most of her skins seem to be lacking in that regard. I assume it has something to do with the design of the blades, but when base Irelia moves her blades it really feels like they're moving in unison, in harmony. The skins mostly just feel like separate blades being moved around. They don't seamlessly flow together like water the way the base skin does.
Order of the Lotus pulls it off pretty well(though i dont think as well as the base skin), but the rest(particularly Frostblade imo) all do a pretty 'eh' job at it. Their blades just don't seem like they're designed for the same kinds of motions the base skin and Order of the Lotus pull off.
Frostblade in particular also feels like the blades are too 'thick' to actually move the way they do, plus that horrible fur thing on her neck just completely ruins any sense of flow to the character. It looks so big and clunky and doesn't fit at all with the whole 'blade dancer' theme. (also i don't like how 'frostblade' has turned into 'crystalblade', if you wanted to have a crystal-themed irelia skin just make a new skin instead)
Anyway, as critical as I am here, I do wanna mention I think Riot does a really good job with this game overall and that I appreciate the efforts of any Rioters that read this post. Have a good day! ;D