I agree. I used to browse /r/all all the time, but now it's just untenable. There are a handful of good subreddits left, and if you only read those it can be OK, but man you're right it's 99% garbage. I feel like I'm conversing with a crowd of children when I use that site. Every once in a blue moon you have a logical discussion with someone, but it's definitely the exception rather than the rule on reddit these days.

I see your account is 2 hours old, so welcome to saidit! Here's some more stuff about the site if you want to learn more about how saidit works and how it differs from reddit: https://saidit.net/s/SaidIt/comments/37r/welcome_to_saiditnet/