Yeah, the pikmin AI was atrocious at times. You would think after 5+ years of development it would have been better. One thing that annoyed me was that when i would throw a single rock pikmin at an enemy and kill them, it wouldn't automatically go in to carry it back to the onion. Every other pikmin type would automatically do this, but 95% of the time the rock pikmin would not. Also, when you whistle for the pikmin, they will always just go straight at you without any concern for themselves, whether it be through water or fire, or even into a wall because you are up on a ledge and they are to stupid to walk around and up a hill to get to you. I know it was this way in Pikmin 2 but I was really hoping they would at least improve it somewhat.