Between... * feeling completely overrun with sensationalized politics; * the new design feeling sluggish and painful even on my maxed out late-2016 MBP; * the general community feeling more hostile and downvote-heavy than ever before; * and the content being increasingly image-, video-, and meme-focused... reddit has really lost a lot of its magic and appeal to me. I do still use it, but I find it almost intolerable…
Most of your criticisms are solved by unsubscribing from those bad subreddits like politics, funny, and all the picture/meme ones.
The content moves so quick, and the user base switches so much, many subs wind up with the same post/style of posts over and over.
The search has at least gotten better and sidebars help somewhat, though the new redesign kills both of those items.