B1 battle droids were battle droids that made up the backbone of the Trade Federation Droid Army and the Separatist Droid Army. Often called "Clankers" by Galactic Republic clone troopers, they were the successor of both the HKB-3 hunter-killer droid. and the OOM-series battle droid.
B1 Battle Droids... Could they have been any less intelligent? Could they have had worse personalities? I think not. Again, it seems like part of the Neo-Star Wars design for poor attempts at humor and lack of critical thinking behind a character (for example, why would the Trade Federation program any personality short of something ruthless into these droids?).