Quirky, fun, and good to be evil. Overall experience overshadows the minor flaws.
The game is not perfect, but the shortcomings can be overlooked due to the fun factor of the game. Some of the more difficult missions reveal the weakness in the minion control scheme. You may find yourself scrambling to get your various groups of minions where you need them in time only to have them wiped out because you weren't quick enough with the controls.
But Overlord is a game that doesn't take itself seriously, and you'll enjoy the overall experience. Gather up your minions and head out for some rampaging. Save the citizens so they can worship you, or slaughter them for the fun of it. Pillaging has never been so fun!