It looks just fine and plenty bright, although it is clearly far worse looking than your regular glossy screen (since that's their perfect conditions). So in that scenario I would prefer a glossy screen because the colors are better BUT I would have no problem with a fully matte one.

And then in a fully dark room, I would again say the matte it superior to glossy because it's brightness feels much less abrasive to the eyes (but my eyes tend to be sensitive to light, I'm the kind of person who needs to change his screen luminosity depending on condition, so for people who don't care about that it would be glossy being better due to the colors I guess)

The matte screens I've worked with are plenty bright for such situations.