As far as I'm concerned, my town is pretty perfect. I have everything needed but whenever I talk to Isabelle, she tells me that the citizens say that it's "riding the so-so rails" and it's so annoying because I see no faults and the only flaw she points out is "all the weeds and garbage".
I have scoped my town a hundred times for weeds and garbage and there is definitely none, but it never changes.
However, the other day it changed to something like "goodness gracious if it goes on like this, this town'll be great" or whatever. I was like "wow!" finally some recognition for all my hard work. Then, I time-traveled a little bit, (only a couple hours), then the next day it went back to "riding the so-so rails". There are no weeds or garbage!