Absolutely untrue, for almost the same money the M&P is a much better rifle than Bushmaster. If you can affordthe LMT is a very nice rifle, you can buy it as an upper and lower and spread the cost out. You can also get a BCM upper (bravo company usa) upper which is essentially the same as LMT but with taper pins for a little less.
i cant speak for the lewis machine rifles as ive never had immediate experience around one (but im sure they are fine rifles.)
i can only speak from experience with the ones ive owned. colt and bushmaster.
out of those two the bushmaster is superior in every category i care about.
accuracy, reliability, and fit and finish.
my colt came with an accuwedge to keep the upper and lower tight. without it it was far looser than my bushmaster, which doesnt use or need one.
my bushmaster is quite a bit more accurate even though the colt was a model 6700c national match target rifle. (about 1.5" vs. half that size at 100yds)
and perfect as far as reliability goes.
this was the closest category because the colt was pretty reliable, maybe 5 failures in 5k-6k rounds. but 5 to zero is 5 to zero.
i would fold to the suggestion that maybe i just got a daisy from a pile of lemons if it werent for the fact that my brother got one just like mine with the same results, then another buddy got one just like ours except he got the a3 model with the same results, then another friend got their orcm4 with the exact same results. (my son is buying one next)
this is all just first hand experience, and not from any research ive done on the chart or the web or anywhere else but in the field.
the only other experience ive had with others was a guy at the range back in the summer with an m&p.
it shot circles around our groups (2-3" circles) maybe he just couldnt shoot or it was new or whatever, i dont know anything about him.
im sure the others on the chart are great but for me results are the final word. period. sorry if my opinions and results are different from others, bryan.