When I started shooting my M&P22, I quickly agreed with several reviewers that the gun was not an accurate shooter, but, was really disappointed to find out how picky the gun was pertaining to what ammo it would feed and not feed. Someone on one of these sites said how his gun had the same problem but after about 1000 rounds, it started to feed better. I kept shooting and my gun began to shoot ammo that failed to feed after about 1000 rounds also. Maybe the slide return spring became softer??? My thought was if it had been made by S&W instead of Walther, it would have been a better gun. (I've read, and seen, some bad things about the Walther p22). Still trying to find a holster that will fit the M&P22 without pushing the slide back.
In 22 pistols, I also own a Ruger mk II and a Ruger SR22. IMO put your money on a Ruger mkIII.