Ahhhh. Then I REALLY disagree. There are many excellent non-Leica rangefinder lenses (the CV Nokton 50 1.5 being a prime example). But generally speaking, the Leicas are better. Overpriced? Almost certainly. Overrated? Not in the slightest.
The 50 Cron ASPH APO, 50 Lux ASPH, 75 Lux, 35 Cron ASPH FLE, 90 Cron APO...these are the best lenses you can buy in these focal lengths. They're hideously expensive, and probably not worth the premium over the Zeiss or CV equivalents in most cases. But they're unquestionably better lenses...just poor value.
As for the cameras, the film Leicas are unmatched; unparalleled. There really is no better film-based tool for street photography.
The digital Leica Ms are...less impressive, at least to me. They are not technically brilliant (with the possible exception of the Monochrom), and again are hideously expensive for what you're getting. My personal feeling is that as nice as it is to shoot with a Leica, they're not nearly worth the premium over far less expensive cameras that can produce as good or better image quality.