Umm..... I have no problems with skins.
In fact, I used anime style skins on CS a long time ago, like Gundams on the CT team and EVAs on the Terror teams.
They're also helpful in aiming since they have such colorful models.
Anyway, they are only client side. This means no one notices anything.
Also, I remember models being used as "cheats" in old versions in CS, like one colored models with huge spikes so you can see they coming. That's why current CS models have very specific restrictions.