All those things suck at reddit, but to me the fundamental issue with reddit is upvoting/downvoting + a massive user base. Subreddits get too large and are dominated by lowest common denominator quips and memes to the point that the content is junk food for echo chambers. Every so often some bit of insight can rise, but by and large that's the problem and it's fundamental to reddit's DNA and no UX fixes would solve that.