All I knew about KinnPorsche before watching was that it's supposed to be about Mafia, and that the kissing/sexy scenes are some of the best that can be found in a BL series. I expected to hate this, but I have to say that it wasn't as bad as I thought it would be.
For the Mafia part, I'm already used to the theme being romanticized to ridiculous extremes, so my expectations vere really low to begin with. It still didn't feel like actual Mafia (if it did, I would have wanted all the characters dead or in prison no matter what), but it's still better than other representations I've seen.
For the kissing/sexy scenes, I have to say that the fans were right! There are none of those awkward tight-lipped kisses where the actors look like they'd rather be doing anything else. There's good chemistry with the couples, enough to make one think that the attraction and the feelings are there. The cute/romantic moments among the couples were adorable and pulled at my heartstrings the right way, which is what I like to look forward to in a BL.
The music is on point most of the time, special mention for Jeff Satur's "Why Don't You Stay" since it's obviously the best song. They also didn't exaggerate with the sound effects, which is the bare minimum but still appreciated.
Unfortunately, the good sides of this series end here.

The plot is very confusing. The characters seem to change alignment and intentions at every other scene, and they also seem to move and behave according to what it's necessary for the writers, rather than common sense and logic. The powerful means of the Mafia are forgotten when they're needed the most, the highly necessary bodyguards are left at home when a family member needs protection, and so on. Even the main characters are guilty of this.
As for the couples, as good as they might look together, their intentions and wishes are always so confusing that it was hard for me to appreciate their stories.
KinnPorsche are the protagonists, yet I still don't quite get how did they fall in love. I understood that there was at least some attraction from Kinn toward Porsche, but they jumped from barely tolerating each other to being madly in love with each other. It's truly a shame, because they do look convincing when they're together, but the plot doesn't hold up their relationship.
VegasPete were more convincing just because their relationship is unhealthy all over. We weren't shown much about them though, so I can't really say much.
KimPorchay were easily the worst couple. I still didn't get Kim's feelings toward Porchay; it felt like it was supposed to be a romantic relationship, but to me it looked more like a brotherly one, as if Porchay was Kim's new little brother. The thoughts and feelings of both were such a mystery that it was impossible for me to appreciate their dynamics at all. Part of this might be because of the actors, though: Barcode is a lot younger than Jeff, so even when he was supposed to look in love, he just looked like a very affectionate little brother.

In conclusion, even though I enjoyed this series to some extent, I wouldn't recommend it. It's not really an action series, not really a romantic one, and not really a comedy, just a very confusing hybrid. It can be entertaining if you're mostly focused on the ships and don't care much about the plot, but that's it.