There is one thing that bothers me a lot with few skins.

It is when these skins could be replacements for the actuals, outdated(depends) models and still fit right with the lore and the "classic" aspects of the champion, but you have to pay for it. For example, there is Spirit Guard Udyr, Captain Fortune/Gankplank (I know, Cpt GP was free after its rework), God Fist Lee Sin (if you keep him blind tho), ...

I don't want to complain about it but still it bugs me a lot. :/