I've got a 2011 328 xdrive, 26k miles, zero issues whatsoever.
Only two things, the fan has a funny noise on super cold starts, and I got an increased battery discharge warning a couple weeks ago.
Battery warning was because it was -40 out (it also had a tough time starting), and the fan noise is also because its cold. If it persists into the spring/summer with warmer temps I'll get it looked at.
Overall score, I'd say a 10 (knock on wood).