Good looking model.
Would maybe give him some larger arm/shoulder muscles, to accommodate wc3's"epic" scale model proportions. Looking at the model from a far-away top-down view makes the arms small compared to, for example, how bulky orc grunts look in the game. Duke Nukem should look like a power-house muscle wise.
Animations wise, I think the gun should rest a bit longer in the air when attacking, pointing toward the target. Maybe add a muzzle flash.
The move animation is a bit stiff, but it works out for the model, because it makes him look like "he has no care" in the world.