I've had a few M&P's and haven't had any issues with any of them. My 9c is one of my favorite carry guns. That being said, I think Springfield makes the absolute best polymer frame pistols. I have stupidly sold/traded the two that I owned and have regretted it ever since. I have dealt with S&W's customer service on multiple occasions and they always have done right by me. They even sent me a brand new Wilson Combat rear sight for my 1911DK without any question when it broke. They didn't even ask me to send in the broken sight. That's a $100 part that they just put in the mail for me. I'm sure they will take care of your problems.
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