I agree with what was stated earlier that 'why shoot Leica' has been infinitely discussed and will keep on being discussed...
But since I feel like it, I'll offer my reasons for why I still shoot Leica (digital - sorry film guys, I have no interest in film 🙂 ).
It started off for a technical reason: I was fed up with DSLR AF waffling with wide angle lenses. Turned out RF focusing with wides was great and I always knew where the focus would be. I didn't have to constantly over-shoot just in case AF waffled and missed, because it was really difficult to see AF misses with wide lenses through DSLR viewfinders. I'm not talking about way out of focus, but enough out of focus to not be recoverable in post...
The more I shot with the M9, the more I liked the RF experience, even though technologically it was about 8+ years behind the curve with respect to electronics, performance, etc. The way of seeing through the viewfinder really did it for me. I learned the RF was a great tool for instantly knowing how close or far off focus was, which I could then correlate with the shooting aperture and an idea of DOF to determine whether or not I really needed to get perfect RF coincidence.
For me it's a fast and direct way to shoot. No focusing screen onto which an image is formed, rather, I'm looking directly through the viewfinder at the subject and the RF patch naturally just floats there in the middle. And never mind EVFs... even worse IMO at detaching me from the scene.
But it's also horses for courses. I sometimes do shoot the M240 with the EVF if I want to line up something nicely with certainty, or use a polarizer and see the effect. It's also the only way I can shoot non-RF lenses on the M. I still have my DSLRs because they are bread and butter for AF with tele lenses and won't be giving them up any time soon (though will eventually transition to a comparable mirrorless system).
I agree Leica service/support is terrible, compared to CPS and NPS. There is no apologizing for this, but it seems Leica doesn't care. Because I want to use my gear rather than have it sitting in a bin at the service department for a couple months, I carry on despite RF mis-calibration and some other annoyances here and there.
But while it's not perfect, it still works. I know how much each lens is off and adjust RF coincidence accordingly on the fly. In a way, I 'know' my Leica kit and how to get the results I need, despite any problems.
Sure, this would drive many crazy, given the cost of the gear and that for many the correlation between cost and expectation for perfection is proportional. But I gave up that expectation long ago. So long as it keeps working - i.e. I can focus via the RF predictably and it still records images correctly. To me that's part of the beauty of the RF system - it's still possible to get 'perfect' results from a flawed, mis-calibrated set of hardware. And if the RF totally went out of whack, I could still fall back on scale focusing. Try that with a misbehaving or mis calibrated AF camera.