I can’t really relate to all these complaints.
Agreed. Of course, matters of taste are matters of taste. But "not happy, not content" seems to be the basic mode for many people these days. I found this to be a funny story with very cute art and great characters. It was a bit different than normal, had surprisingly some character growth (lol) and had a good and clear ending which is a bit rare.
And I think that the ending wasn't THAT fast. Maybe it just feels that way for some when the chapters have been coming out at a pretty fast pace lately? I don't know.