Just got my PM40. Went shooting today. 50 rounds at 15 yards in a 4 inch group using the 5 round magazine, no magazine extension. Shooting while standing, not bench rest shooting. No control problems here. I don't know why, but it seems like a lot of people really dog the PM40. It sounds to me like it doesn't matter what you shoot, you just have to know how to shoot. While in the military, I shot 298 out of 300 while qualifying with the standard issue Beretta.
Just sounds to me like a lot of people need to get back to the basics of shooting.