The most USELESS monster.

I almost never took Ogre Mages in the regular version; I haven't played Barbarians online yet, and I haven't played with them in the expansion at all, although as far as I know, they've become more useful. The number of spells has increased by 6, which is a big plus because Barbarians only have Centaurs as ranged units (if you buy Ogres). And even those have only 6 arrows, and the range significantly reduces the throwing power, so they are only good for defending the castle, and Smoke or Magic Shackles will be good against several heroes if you have single Ogres + Bloodlust on the creatures.

Added 1 minute ago
I don't know about the other spells yet.