This ain't some pansy ass AVN for boys, Superhuman is your dad's AVN, very long and hard hitting.
Let's get the cons out of the way, or potential obstacles that might make you miss out on the greatness that is Superhuman.
1. Obviously the art - the early art is something that likely you won't be too much into; the choice of some of the girls having size 85WWW tits is something else that might steer you away as well.
2. There are some typos and grammar hiccups here and there, they are few and far between but they are there.
Uh... that's about it.
Things that are subjective, a.k.a. you might consider that a plus, or a negative, or you might not care at all for it:
1. The music. For me personally, it's a plus as I enjoy rock and metal, which is often utilized, as well as some electronic tracks. Early on some tracks might repeat, but as the game progresses, you'll hear new tunes, but by god, the boss fight music is just excellent.
2. I hope to fuck this doesn't come as a surprise to you, but in a game called Superhuman, there's fucking of beings that aren't strictly human. There is some really freaky shit in here, and I mean that quite seriously. If that's something you're not into, this game might not be for you.
3. The game is not complete, but even so far it is really, REALLY long. This is not even remotely a short ride.
4. The game's overall tone is darker than what you might be used to. Characters go through trials, they get hurt, and that's if you play as a good guy.
Well, if the cons are something you can accept, and if you consider the parts that are subjective as positives, you will enjoy an adult visual novel. This seriously is excellent writing work and could work as a book easily.
The game is this long because there's a lot of written stuff, but that stuff is of very, very good quality AND substance, and there's a lot of it. It starts strong, but as the game progresses, it gets even better. It might not give that impression in the beginning, but the world of Superhuman is vast, there is a lot of lore, there is a lot of depth explored to the way things work but the best part for me is the character writing and development.
Even minor characters have a purpose in the story, and none of them are mindless husks to fill a quota, they have a reason to be there, and if minor characters get that treatment, you can bet your ass major characters not only have a lot of screen time, but it's of high quality. They are a certain way when you start the story, but change throughout, they affect the world around them and are affected by it, all in meaningful ways. The principle "it doesn't get easier, you get better" is applied here. Some characters you might don't give a single damn about in the start, but you'll grow to love, some you'll start off hating them then come to love, some you'll love THEN hate THEN love again, and some you will absolutely love to hate.
Some random bits that I enjoy in particular:
1. MC's parents are absolutely fucking hilarious, best mom and dad in an AVN.
2. Specifically the boss fight music for a certain fiery brat.
3. The character design for certain... beings in the game. Absolutely unnerving, but creative as hell.
4. Some lewds are both freaky and funny as hell.
This game is big and I am probably forgetting whole ass paragraphs right now that I need to write, but long story short, when you are tired of waiting for updates on your other favorite "big" AVNs, you might as well give this one a chance, because for me personally, after playing damn near all other big names...
For me, Superhuman is currently the best written adult visual novel.