It's only a matter of preference. I personally hate glossy screens. Some people like them because the colors often seem more vivid and they prefer colorful as opposed to accurate. And yea the reflection is another thing to consider... But as I understand it, Ultra BrightView has 2 light sources, so in theory the screen should be brighter. So as long as you do not angle the screen to get reflections, it the picture quality should be good for gaming.
After switching to LCDs from CRTs way back when LCDs hit the market and CRTs became obsolete, I can't imagine how anyone can do anything, much less game, on reflective screens. But, if you are in a dark room with no other light sources that may reflect off such as a window, you should be good.