Max hit is 126 (before modifiers such as Champion and Might are taken into account); the max melee crit from it is 222.
It's a great hammer for the soloing shaman due to the stun [which works up to L65 rather than the L55 of weapons with a generic "stun" proc). However... if you use it in groups (especially with Greater Rabid Bear) you'll get aggro if the tank's not paying attention!