This sort of thing is often thrown around the gun community. S&W wanted legislation to ban high-cap pistols so they could sell their revolvers. The major manufacturers want bans on surplus guns so they can sell more hunting rifles. The NRA just wants to prolong the fight so they can keep taking people's money -- they aren't really interested in finishing it "once and for all." Machine gun owners don't want to see the Hughes Amendment struck down because that would ruin the value of their gun collections. Remington and Winchester hate the CMP because it takes away their sales. Ruger doesn't care about civilians' 2nd Amendment rights. And on, and on.
Some of these things are based on some nugget of something that was almost true way back whenever or MIGHT have looked "truthy" because if you only think about it with half a brain it sort of looks like something bad might slightly benefit someone on "our side." Old scores are brought up for re-hashing decades down the road by folks who's granddaddy said that ... whatever. Don't believe most of what you hear. (Don't even believe half of what you THINK!
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Over-rated is the first thing anyone says when a gun isn't just like whatever they're used to. Honestly the new M&P line is a very well-performing firearm, very capable in a skilled shooter's hands. They've got the occasional problem (so does Glock....and how about those 1911s?!?) but most shooters running them hard don't find them "over-rated."
You should do very careful study into exactly what proof there is that any company has done so ... recently, in it's current iteration ... and analyze how that company is actually doing for/with the shooting community today before you make an unfounded decision to eschew any maker for political misdeeds.