Some flaws are systemic, some strong vignetting with wide angle lenses through the short back focus or an unsafe sharpness control with telephoto lenses due to the low measuring width of the rangefinder. Other shortcomings are "built" around the display with his meager resolution, which is not always safe exposure or camera sensor with a relatively low sensitivity for today's conditions and a sensitive surface to cleaning fluids. Not to mention the very portly image processing and data transfer, as well as the somewhat weak battery.
But, and that should give pause to a nearly all important pictures of the 20th century have been made with a Leica. The reason is that it forces the photographer to think about focus, shutter speed, aperture and the image section, the reason is that you practically "invisible" photographed with a supposed "Opa" camera as opposed only latest DSLR and it is up to the excellent lenses not last. The clear operation stands out pleasantly positive. With the Leica many shots I managed already, so I had no other camera can do. If one is wide, to engage with the restrictions and follow up with the pictures carefully, you will not want to miss this camera.
But that did not mean that the current DSLR Bolide remain in the closet. For fast action and extreme Availiable Light Photography has its justification in any case. As you come really close with the Leica.
I glue on the Leica logo a piece of black tape. Then you will be spared from the curious and can concentrate on the important thing: taking pictures.