They go where you want them to go, but as there can be up to 50 of them in a group their personality and class will dictate what they do when they get there. Lead your faithful followers into a pumpkin patch and they’ll carve the pumpkins into helmets (upgrading themselves in the process). Send them into a herd of sheep and it’ll be a case of lambs to the slaughter as the goblins fall on them. Force your minions through the door of a house and you’ll hear whacking and fighting from within, and they’ll come out again with loot for their master and probably wearing pots on their heads (another upgrade).
Controlling your minions is endless fun, and their class strengths and weaknesses come into play solving puzzles. For example, the red imps, who spit balls of fire into their hands and lob them at the enemy, are also immune to fire, making them perfect for sneaking through flames to trip switches.