I looked through the top sites on Area 51 to see if I thought the new voting system was letting better questions win.
Bottom line: YES! (Here's the data.)
Here’s what I did. I looked at the top 12 sites by follower count. Myanmar doesn’t have many questions, so that left 11 sites.
For each site, I looked at the on-topic list for questions with more than 5 on topic votes, with no more than 10% dissent, and the same for off-topic.
I counted the number of questions that qualified, and then read them all to decide if they are actually good site definitions.
In every single case, we have good site definitions. That’s 100%. That’s up from 30% under the old voting system. Ergo it is my humble opinion that the voting change was stupendously successful in terms of getting better site definitions quickly.