Colour matching on a glossy screen is of course possible but it is more difficult than using matte. One reason being that screen calibrators are less effective on glossy screens.. hell, the LED backlight on my LCD causes enough trouble. It makes no difference to me as I do all my work on an external display (for real-estate issues more than anything) but you can't argue that matching issues on gloss are solely contingent upon 'inexperience'. It is simply more difficult to accurately match for CMYK. This is one of the reasons you will never see a hi-end external display with a glossy screen, the added contrast/saturation which, is increasingly variable on angle, throws off calibrators and ultimately your colours.