People just like rich, darker colors, and sharper images, so people get glossy (i am not trying/starting this debate over again) Some people can handle the glare, some people can't basically. All about preference.
To OP
It's matte. Was your MBP a BTO one or just stock?
I would call apple to get this thing sorted out. BTO maybe be a bit harder though
i still do not know why upgrading the hdd makes apple think its tainted when its their drive they installed