What exactly did you not like about your full size M&P
The accuracy. At say 15 yards plus it would be all over the place. There are documented cases of accuracy issues with some M&P 9mm fullsize models.
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness