If you're used to SLRs, the Leica M might take a while to get used to. For example, I had to change how I focus to make it work for me. Instead of turning the focusing ring too much I instead move back and forth to get things in focus.
I also had to change how I hold the camera in order to make it more stable as I press the shutter, by supporting the entire camera with my left hand palm, and only use my right hand to press the shutter release. Little things like that make it better.
I would say that a dozen rolls may not be enough to learn how to make it work, but if it's torture and difficult to get a good print, perhaps it isn't worth it!