I've never heard of the accuracy issues with M&P's. If they were that bad, then you'd hear about them like Glock Kabooms and Brass-in-your-face problems, but you don't.
I've owned 2, M&P9 and M&P40 fullsize, and both were accurate and problem-free out of the box. I also own a Glock19, and shot many other Glocks. I've heard more Glock problems than I have with M&P's.
14guns isn't that bad at all. Sell one handgun that costs around $450-500 and buy a M&P.