If Leicas were as hopelessly unreliable as some people seem to think -- "You just never know what will happen next with a M camera" -- then nobody in their right mind would ever use them, and Leica wouldn't be able to sell 'em.
Yes, my Nikon Fs are tougher. If I HAD to drop one of my cameras from table height to a tiled floor, I'd choose an F over an M, and not just because they are a lot cheaper. But most of the time, I don't drop my cameras, and as I say, I've been using 'em in Europe, Asia and North America for decades. An M2 jammed once, but of course I had a backup, and the other two problems didn't render the cameras unusable: you can still shoot through a cracked viewfinder glass, and I straightened the bent rewind on the spot with my Leatherman. I'm still using the latter camera without further repair.
Of course my experience is only anecdotal, but as I'm not the only one who uses Leicas reasonably hard (plenty use them harder, including one chum on Fleet Street who won most of his press awards with Leicas), I suspect that the belief that Leicas are quite reliable is not based entirely on myth and snobbery.
Cheers,
R.