Characteristics that make Marauder unique and how they can be improved:

Big-ass axe
Give us more varieties of axes.

HP sponge tank and parry tank.
Emphasize the Maruader's parrying abilities and give him skills that take advantage of its high HP.

Fairly decent damage
This is fine now.

AOE.
Hardly any use for this outside of leves. Create more leves that have mobs come in groups larger than 3. When fighting non-leve normal mobs, let them claim up to 5 at once. Let Marauders and other classes use their AoE abilities more, and battle will be more entertaining.

Steadfast Stance
Develop this concept further and integrate it more into battle strategy.