Well, to answer this one:

The amount of low quality posts is 19,726 and rising.

I think that's a part where we could really do better. I've started to increasingly downvote lazy, bad, poorly written answers, but it feels like a waste of effort and reputation (on my side), because

• the user doesn't care to fix a bad answer, and, more importantly
• the user gets their reputation back from even one upvote ("Hey, somehow this is useful!")

In the end, I came to the conclusion that the approach downvote → comment → wait for user to fix, or edit the post → tell them how to do better doesn't really work.

So, what should we do? Provide a better answer. Simple as that. Works most of the time.

Well, to answer this one:

The amount of low quality posts is 19,726 and rising.

I think that's a part where we could really do better. I've started to increasingly downvote lazy, bad, poorly written answers, but it feels like a waste of effort and reputation (on my side), because

• the user doesn't care to fix a bad answer, and, more importantly
• the user gets their reputation back from even one upvote ("Hey, somehow this is useful!")

In the end, I came to the conclusion that the approaches

• downvote → comment → wait for user to fix, or
• edit the post → tell them how to do better

don't really work for all users. Some react and you can see progress, others simply don't care.

So, what should we do? Provide a better answer. Simple as that. Works most of the time.