I think discussing Leica product quality is pointless. They are some of the best cameras one can buy, but since I can’t afford them, I’m happy to use my Nikons. If I could afford a Leica, I would probably have one by now.
The problem is not with discussing a particular product's quality, is it? The problem is when people stop being reasonable, polite and sensible. Preferring to pick apart every valid point in an attempt to "win." My guess is that many "Leica Haters" have never used a Leica. My guess is many Leica Hater Haters haven't either.
Discussing a product's merits is important, I should think. The win comes from peacefully agreeing to disagree, not leaving bloody bodies on the e-battleground. Remember, you should always allow someone to come to the conclusion you want them to come to on their own.

This is not the Battle of Chancellorsville.
So, let's see: Leica cameras are well made with good optics. Leica cameras are expensive. Not everyone can afford one so they argue. Some purchase a Leica as a status symbol, with no idea about what makes a Leica so great. Japanese cameras are also very good. Use what you want and can afford, and build up your technique rather than tear down another photographer's choice. If you want tack sharp 11 x 14 prints, use a view camera and make contact prints. Wratten #15, #24 and K2 are your friends and slow film rules.
Single malt scotch is a marketing gimmick, Vintage Indian Chiefs rule the land, sea and air and Ansel Adams used F64 for a reason. Use more fountain pens, hug your kids and give a stray dog a treat.
I am out of things to say.
Bob