I've heard of it being used to clear the first part of the Bug Temple. Cast summon monsters on top of the stairs and get yourself surrounded by goblins or kobolds or whatever. Descend and take them with you. Now you don't have to fight all of the claw bugs at once because you have a protective shield of weak monsters.
If you're desperate for food, I can imagine it being used to try to get some corpses quickly. I've used wands of monster creation for such purposes on rare occasions. It might be useful for pacifying levels, I guess. I've never tried before, but there might be some sneaky uses for it if combined with alarm traps: If you're planning on fighting a boss, make a bunch of alarm/fireball traps in a room and lure him there. Then summon monsters, and pull the summons all over the traps. Boss starts attacking the monsters that triggered the traps instead of you.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.