Earlier quoted context omitted.
This is a good point, you just have to leave the mainpageish universe completely. /r/linguistics has interesting stuff. Similarly the subreddit for creating your own language is also neat, but these are niche, small reddits. The big reddits have been taken over by group think and are difficult to read and often boring.
everybody who's been on usenet for a nontrivial amount of time has experienced exactly what you describe, several times. expecting reddit to be different is like hoping for world peace. you should instead assume that degradation of quality will naturally happen as a community forum becomes more popular and either introduce moderation or fork off a smaller forum... and both of those happen, as you noticed. this commen…
Of course, it'd be tough to gain traction with users who believe their karma score matters. Better to hide it from them completely and indicate scores in another way.