Why does the Default Udyr skin suck so much?

Wait the skin art or the model? Because I dare say the art is really nice.

The model is a relic of the past. You can argue it's of lower quality, and that's kinda what you get for a champion released in 2009 with no substantial visual updates, but it's best not to change it unless you're going for a major overarching update because that lackluster model is Udyr. If models changed willy nilly, the instant identification skill that every player has would be thrown out of whack just a little too easily and that is just no good at all from a gameplay perspective. If it ain't broke, don't fix it after all.

Because he needs a totally new VU

Why VU Udyr for free when everyone is willing to pay for one?