Tinkerer focused decks are weak to Jabba + Vinto or rider shock lances as easy ways to kill the droid
however after the new errata, you get a bit more mileage out of the droid if the opponent doesn't take it out. Rebels actually have a hard time doing this and their white dice is weak to the junks attacks. I've found 1 to be quite useful as an objective figure and the droid easily can contest any terminal early. It can follow up with some attacks, I had it net me a few points of damage on a JK Luke and did the killing blow to an eRanger while my tinkerer went to interact with objectives