Caveat: I despise the Infernal skinline. I think none of the skin is bad in a vacuum, but I think they're by far the most uninspired, plain, and least surprising skin line ever. While most skin lines attempt to translate a certain champion in a new setting or universe, the Infernal skins are simply "make them all look the same, slap some fiery VFX and call it a day". I could literally imagine Infernal Olaf in my head and I'm sure it would look exactly the same if they actually released that.
So you understand how this is even worse when you see how it's basically become the dumpster skin line for champs who haven't got a skin in too long, so instead of putting effort into a nice skin they just make an Infernal skin for them.
Just look at the last Infernal Skins we've had: Karthus, Kennen, Vel'Koz, Varus, Shen, Galio, Amumu. It's just plain sad.