I'm a 1-million-point Udyr player, and I'll give you my current opinion on the champion.
He suffers from a lack of movement speed.
He has absolutely no resistances, even when building tank items.
Did I mention that HE LACKS SERIOUS MOVEMENT SPEED AND THAT ANY WALKING PIECE OF SHIT RUNS FASTER THAN UDYR?
Also, any fighter beats you because—unlike Udyr—they actually get good resistances from the very same items Udyr builds; so why does the game think it's okay for everyone to beat you? And above all, you can't stay alive for even two seconds in a teamfight because you just get shredded.