Besides its high damage, its boost to attack speed may help to counteract the very slow attack speed of a Great Maul.
Steeldriver has a high enhanced damage modifier (up to 250%), something not often seen on Normal grade uniques. When upgraded via the Horadric Cube, this weapon becomes quite formidable with a level requirement of 34 and only 85 strength needed. It is sometimes even feasible to upgrade it all the way to elite, and socket (using Larzuk's quest reward) it with a Shael, or an Enhanced Damage/Increased Attack Speed Jewel, for even more speed.
Two-Hand Damage: (95-133) To (145-203)
Required Level: 29
Required Strength: 50
Mace Class – Very Slow Attack Speed
+150-250% Enhanced Damage
+50% Damage To Undead
40% Increased Attack Speed
Heal Stamina plus 25%