Nope that is not bad at all. Every M is going to use some oil, some use more than other. I was told at the dealership by one of the techs, that the M3 can use a qt. about every 2-3k miles. It is concidered normal. So you are doing good. Mine is around 4-5k miles I think. But I don't drive it everyday, so it is hard to notice. Let me know if I helped you any or you have any more questions.
'09 E92 ///M3 Interlagos Blue, 6MT
, Silver Novillo Leather, CF Trim, Premium Package, Technology Package, Cold Weather Package, Premium Sound, 19" Wheels, Moonroof-Toy//
'02 Nissan Xterra- Daily Driver/
'04 Yamaha R1- Toy/
'06Yamaha Raptor 350- Toy