People on Reddit keep saying things are mostly back to normal, while tiny subs are hitting the front page of /r/all on the regular with like 2k votes.
Also, I've noticed a pretty significant increase in overt racism. Or rather, significant decrease in moderation of it. I shouldn't be surprised but it keeps catching me off-guard.
For myself, the quality in posts has dropped significantly. I'm always challenging myself to learn, I also learn better with things that interest me. I've found since Boost for Reddit went down that not even old reddit is catching my attention. I feel bored. This is for popular or r/all. If I'm on my own homepage it's like Reddit never changed as I'm subbed to mostly all small subs.
For my frontpage the change is small but still noticeable:
/r/pcm was always holding on by a thread, it looks like all the quality posters and moderation have left/given up.
/r/chess is down about 10-20% of its normal upvotes
/r/ProgrammerHumor is down about 50%
/r/Sysadmin is surprisingly normal-ish for upvotes, but the posts aren't great. Although that sub has been mostly off topic rants for a while now... not sure I want to purely attribute that to the API change.