I love him as a character, I really do. Vikings are awesome. And I had a couple great games with him last night, 16-6-12 and 13-5-1.
But he just seems bad compared to your other jungle options like Udyr. Not having Bear and Turtle for survivability and chasing is sad. If my ghost isn't up I really have a lot of trouble catching up to anyone. You can also build tanky Udyr for great survivability and still stun like a boss and do okay damage in teamfights.
So, convince me to give him a chance. What kind of builds do you guys use?
I feel like I need Zeal for chasing, life leech for sustainability, Mallet for hp and slow, boots 2 fairly early for chasing. He's just pulled between so many items early game. And you're still pretty squishy unless you get at least 2 more dedicated survivability/tank items in addition to mallet.