Glossy screens can be great in the correct lighting. A few point sources of light that are not directly behind the viewer are great, and you can benefit from the increased contrast that foregoing the matte layer gets you.

However, in a situation where you have ambient light from everywhere, like an open office with many windows, glossy screens are insanely distracting. I much prefer the matte screens for that. Yes things on the screen can be harder to read, but way better compared to the "looking into a mirror" effect of a glossy screen.