To me anyway, Smith & Wesson auto pistols are over engineered. Too many small parts. Yes, it was far worse with the 1006 series of Stainless autos, than today with the M&P. But they're still more complicated than they need to be. Compare any of them to a Glock with only 34 parts total, and I can see why they were eliminated.
As Mikhail Kalashnikov so eloquently said.... "All that is complex is not useful. And all that is useful is simple".