^^ I get that dark cars show flaws more easily, but I have had a series of dark cars, including my 335i, which is Monaco Blue. My paint is pretty flawless and it feels like quality+++
I never had an issue with a dark car as long as I took reasonable care of it. And excessive, repetitive polishing would eventually wear down the clear coat, wouldn't it?
I think there's something wrong with OP's car. Unless (the non-metallic) Jet Black is much worse than the other (metallic) blacks.
Present: 2013 M3 coupe (Azurite Black, Black, Piano Black)
Past: 2010 335i coupe (Monaco Blue, Cream Beige, Grey Poplar)
+ miata nut (2004 GT/LS and 2013 GS/Club Edition)