I'm still mulling over this since I just finished it, but I wanted to write this since I believe the criticism I saw to be way too harsh.
There's a LOT of good in this show, and while most of it is Akk and Saifa (Gawin gets my immediate love always, but his character didn't do him dirty), there are other aspects to love as well.
There's a lot of funny moments, and I laughed harder than I have in a long time at some of the silliness (once again, mostly attributed to Akk)
I'll try my hardest and address other aspects than Akk, since some might not think that one incredible character can save a show.
The music, for one, is lovely. There are a couple times where it doesn't sound quite right, but for the most part I really enjoyed the soundtrack to the point of needing to make a note of it.
The mystery is really not the main focus, despite the title and everything making it seem like it is. The reveal was definitely disappointing, but not nearly as disappointing as what followed. Theo had a lot of chances to be loveable, and I didn't hate him, but he really wasn't a great lead by the end. He had plenty of opportunities for redeeming any of his faults, but he kind of just meandered away from them and chose to be rather self centered. I've dealt with far worse characters, so I didn't hate him, but as I said, by the end I didn't like him very much.
There were so many good moments that made watching this worthwhile, but I'm trying to keep this succinct. The hatred it's getting feels unwarranted, but I definitely understand a lot of the sentiments behind the criticism as I also have a lot of my own. But the journey of the show is where it's good, and I'd be sad if I had missed out on all the incredibly lovely moments by not watching it.
Most of the characters are likeable in some way other than the obvious antagonistic types, but even they aren't completely hateable.
The actors did a fantastic job, and there were a lot of subtleties that tied into things later on, which I enjoyed.
Don't get me wrong, the ending was frustrating and I'm not happy with it, but to dismiss this show as being bad is just sad and incorrect to me.

One of my favorite moments was Akk suggesting that Saifa wanted to perform opera atop the Eiffel Tower accompanied by a hilariously bad green screen of just that.
Finally, I'll stress that Akk is an incredible love interest and I think the show is worth watching just because of him. And I mean that wholeheartedly. My biggest criticisms are honestly just that he deserved better.