It was a missed opportunity not to make the droid army relatives of this guy.
As it stands, the regular battledroids were totally ineffectual and about as threatening as a talking toaster. (TCM invented a more lethal variant just to make up for their lameness.) The only time they actually killed any Jedi onscreen was in the arena battle in AOTC, and even then I doubt they could have done it without the other models.
The super battledroids were kind of cool, until they actually spoke in ROTS, and were revealed to be even dumber than their cannon fodder cousins.
Sidious probably could have taken over the galaxy sooner if he'd talked his minions into just building millions of droidekas.