Udyr is often considered weak; specific builds might be more effective in the jungle than in the top lane.
While he boasts strong sustain, be aware that he is easily countered by grievous wounds and Serpent's Fang.
When jungling, try alternating E and W skill points, as mastery is crucial for this "one-trick" champion.
Stats
Precision + Sorcery
Q
W
E
R