Dolls are at least handy as mules; with the latest patch installed (or in an already updated re-release version) they can carry an unlimited amount of weight (not being able to move when over-encumbered isn't a big deal for a summoning doll). They can also be used to trip area effect traps, though can not open trapped containers.
The act 1 skeleton doll is the only one which can equip a ranged weapon (crossbow), so could provide support for tough fights, as long as it was kept out direct conflict with opponents.
