I just painted a room with satin chocolate brown walls, to be used as my study, I don't mind the imperfections that the sheen/gloss picks up, as I think it adds some character and it was the look I was going after - I used eco Fine Paints of Europe, and it came out great! It's all in the prep - remember there are painters and then there are guys who put paint on walls, I would consider myself at the bottom of the first group!
Good luck!