You mean machine built, which there is nothing wrong with these days. The times of shoddy machine built wheels is long gone. Can't remember the last time I had to take a spoke key to any of my wheels. Well actually I can. The set of hand built wheels on my Santa Cruz, which was so low tension that a single snapped spoke threw the whole thing out of shape. Current mass produced DT wheels on my enduro bike have done two years and quite a few races with no truing or tensioning needed.
As for colour, there shouldn't be any. Either black or silver, but whichever it is they must all be that same on both wheels. Anyone with coloured nipples deserves to have their nipples dyed the same colour. There is also a special place in hell for those responsible for alloy nipples.