I wanted to give this a higher score because it's entertaining enough for a short show and I like reverse harems. But it just didn't end well. I'm assuming it's done because it's been stuck at episode 16 for weeks.
The characters are all kind of tropey characters, you've met them all before in other shows. The familiarity is nice when you want to sit for a couple minutes and just watch something kinda cute, but there's nothing new going on here.
I think if this show had an actual end instead of just finishing a case and stopping without any decent character growth, I'd give it a 6 or so. But the way it is now, there's simply no justification for giving it anywhere near an average score.