That is nothing but sheer gear-snobbery at its finest. There are some people who look down on others with disdain if they aren't outfitted in the best North Face gear and have MSRs. You have to do what's comfortable for you.
I have Atlas 1030 snowshoes, and the things aren't just good, they're expletive good. I've tried the MSRs and thought their grip was a little bit better, but I think overall, the Atlas are more versatile. The large bed allows for some AWESOME glissading (try that in your MSRs), and the crampons are just as aggressive IMO. To me, the Atlas shoes felt a lot more sturdy than any other snowshoe I tried, and I've been able to use them in a wide variety of terrain. They are great at breaking trail, and have tremendous float.
I think where MSR people judge others is with regard to the track. MSR is the most popular shoe, so the track tends to be the width of two of those shoes. Atlas are a teensy bit wider, so it can be a little more work if you're on a narrow track.
But seriously... anyone who tells you that you should only use one brand of anything is definitely trying to sell you something. And I've found tons of people who seem to think MSR is the only thing worthy of being called "snowshoe", but I think its bunk. They're good shoes, but they aren't thousands of times better than Atlas or Tubbs. You're correct that the differences between the top brands is negligible, and all comes down to preference. Go with the gear you like the most, and let those you hike with frown all they want.