I can't answer the poll because there's no choice there I would make.
Obviously, the following is simply my opinion: I believe that, like many things today, the definition of quality has been "dumbed-down". What is often referred to as a quality product now would likely not have made it to the photography market in the 50's and 60's. I don't have any hard facts to support this, only limited observations. There are an awful lot of M3, M2, and M4 users out there who can attest to a time proven, reliable piece of equipment. There are also alot of M6 owners who have/have had viewfinder flare probems, meter circuit problems, battery drainage problems, etc. I haven't heard of many Leitz lenses from the 50's and 60's that are falling apart, but I have heard of lenses from the 80's, 90's, and 2000's with loose aperture rings, poor, flaking paint jobs, etc. These problems with modern photographic machinery are not limited to Leica. I briefly owned a Bessa R3M - it arrived out of allignment, not difficult to fix, but this was a brand new, from the factory camera, very well packed, supposedly tested camera. Anyway, six rolls of film later the shutter broke. Hmm?
Meanwhile my M2 keeps chugging along quietly and smoothly, even though it has to compete with it's bagmate, the M6 with a flare-prone viewfinder and screwed-up meter.