Tx Phantom is right
My M&P9, with me shooting it, is not the most accurate handgun I've fired. That would be a highly cusomized Kimber Custom II. It's not even the most accurate handgun I own (toss up between a Ruger MKIII Hunter and my other M&P, a circa 1930 .38 police special fired in single action). In fact, the first couple of times out it kicked my butt and uncovered some poor trigger technique. It's like TxPhantom said, after some "practice, practice, practice" the M&P9 seems to be shooting where it was pointing when the trigger is pulled. I started shooting it at 7-10 yards and now shoot no shorter than 15 yards. Groups are tighter and more centered around the middle of the target.
I have no complaints about the M&P9. I like the way it feels. The trigger isn't the greatest but it's not bad and I'm pretty confident that if I pay attention to what I'm doing, it will shoot where I point it. I'm still playing with which grip works best for me. (How many others can you change the grip size in less than a minute?) It shoots the cheap ammo I've been firing without complaint or problem. It's nice to see the center of the target start disappearing. The only "improvements" I'd like to see are adjustable sights and a touch of work on the trigger.
As far as I can see, the only thing wrong with the accuracy of my M&P is the shooter, and upgrades on that part take a while to obtain (although "she-who-must-be-obeyed" keeps talking about them.)