I wanna start by saying that I am a huge fan of studio Trigger, the late Gainax, and pretty much anything Hiroyuki Imaishi or Masumoto Kazuya have their hands on and also I loved Ninja Slayer. This anime is dificult to rate. I appreciate that it's my favourite studio's first "work" and I very well KNOW that it's not meant to be taken seriously and is just a parody for fun.
That being said, I didn't enjoy this very much neither ironically nor unironically, unlike Ninja Slayer that I enjoyed both for ironic reasons (the "yeaaaah"s, the photoshop fights, the fanservice, the anime stereotyoes, etc) but mostly for unironic reasons (great characters, writing, cool premises, awesome visual stills and serious moments). Of course this review is about Inferno Cop, but I just wanted to get that out of the way since the two shows get compared a lot. I can make an educated guess that the only reason this is rated higher than Ninja Slayer is 1) It "did it" first and 2) Ninja Slayer is 50/50 parody and serious, which is something I personally like but I can see how it can be something difficult for people to grasp, while Inferno Cop is 100% retarded so that no one but the top 1% of r/whooooosh inhabitants can make the mistake of taking it seriously. There is little I hate more than people taking goofy things seriously, and so I didn't do that with this show, but still it wasn't the most entertaining thing.
What studios Trigger and the late Gainax do so well (which is mainly why I like them so much) is strip shows out of other qualities to their barebones most important one which is fun. At the end of the day, a show can have serious character development, deep lore, deep characters and character relations, complex serious plot and what not yet still be bad if it's made with no "entertainment value" in mind. How are you gonna know about the deep characters and plot if the show is so boring that you can't even get more than a couple episodes in without falling asleep? At the end of the day, the entertainment value and the FUN of it is what matters by far the most. Everything else to it is SECONDARY. Shows like Panty & Stocking with Garterbelt, and Ninja Slayer from Animation, and cartoons like Aqua Teen Hunger Force understood and why they are some of my favourites of all time. If entertainment wasn't above else then why are classic cartoons liek Looney Tunes and Tom & Jerry that have little coherent plot that is only there to create scenarios for slapstick and absurdist humour, still timeless things that are enjoyed by nearly everyone today? Well, that is my philosophy at least, you may disagree with it but I am very sure it's true for people like myself.
In terms of entertainment this show is about as fun as a 4 or 5/10 serious show would be, has no other qualities than that, and it is like 35-50 minutes long in total, I can't give it anything more than 3/10. I wanted to like this, sorry Trigger and Imaishi for I have sinned, but I am being honest.