As someone who wishes to rp as a puppet master, I believe that a rework is needed. However, as Seifer has said, they are exclusive to the Sand Village, therefore the rework shouldn't give them too much of an advantage compared to other summon. Instead of simply buffing their dmg, we could, for example, give them something else such as more control.
My idea is the following one: since these summons are supposed to be controlled by the ninja, wouldn't be a good idea for these ninjas to have more control over their puppets? For instance, the invocator could lock the target of the puppet, use its jutsu (limited to one or two per puppet), etc. I don't know if what I say really makes sense, but that's pretty much my first idea.
Another possibility could be that each puppet would have a speal skill/jutsu:
Puppet 1: small lock.
Puppet 2: buff the invocator (speed, small buff dmg).
Puppet 3: change its position with the invocator.
That's more or less my ideas so far. Will update more later on if something pops up.