I like the choice of Zak's attacks switching from overhand to underhand. Also, the sound design worked well with the animation to convey the speed and power of the swings.
I honestly don't get the point of giving us all these great nerf abilities if all the big bosses are immune to everything except poison. I don't see the point in using the nerfs on the weaker enemies because it's often just quicker to kill them off with damage abilities instead.
What I like about the xp system is how it keeps the early crusaders competent. The lumberjack dude has become my strongest crusader since I've kept him on from level one to 130 some odd.