I think the Inhumans is an extremely difficult project to pull off effectively. I thought they did a good job adapting the different elements. The world building of this Attilan actually worked. Instead of Alpha Primitives, they have a Caste System based on the usefulness of their transformation. The idea of hierarchy based on Terrigenesis is drawn directly from Paul Jenkins's Inhumans run.
This is a bit out of left field, but I would love it if they drew more explicit comparisons to Hinduism. In Hinduism, there are four castes based on the natural roles of mankind (warriors, priests, merchants, and workers/servants). The first three classes are known as "twice born," while the Shudras (servants) are the fourth. I think one could easily see a comparison of those who are transformed by Terrigenesis being "twice born," while those who are unchanged (or mildly changed) are Shudras. Maybe it's a stretch, but I would love to see someone explore that.
But I like the explanation for "Black Bolt's rigid meritocracy" (as Maximus put it). They live on the resourceless moon. They can barely support their population. Because of that, they essentially have a class who has to support everyone else for them to survive (think mutates in Genoshia only those with powers get privileges). When I was leaving, two guys who were in their fifties were commenting that Maximus was actually the good guy and Inhuman society kind of sucks.
Narratively speaking, I thought Maximus's coup was very dramatic and was one of the highlights (particularly when Karnak figured it out and was trying to rescue everyone). I did think some of Maximus's actions after were a bit slow. Hopefully he's given things to do (some of the verbal banter was fine at least). He's too good of an actor to just sit in Attilan doing nothing.
Like I said, I liked the CG for the most part. Lockjaw is going to be the most universally praised. I don't get people's complaints of Medusa's hair. To me, it looked quite good. On the other hand, I'm disappointed that's all they managed to do before taking it off the board for the rest of the series. In fact, I was shocked that the three highest budget items - Lockjaw, Medusa's hair, and Triton were essentially removed from the picture by the end of the first hour. One would have hoped they did more with them while they had the chance. That being said, each one taken off the board made narrative sense and there were similar actions (notably with Karnak but with Black Bolt as well), which were not budget choices at all but were in the same tone.
On the characters, I thought they worked well. Serinda Swan probably bothered me the most, but she grew on me after her hair was shaved. Karnak is a ton of fun. Black Bolt's silent communication (particularly when he's trying to communicate with people from Earth) was good. Gorgon is true to character and the scenes with the Hawaiian surfers were wonderful. Iwon Reon is very enjoyable as Maximus. I didn't like his acting in the trailer, but it's much better in context (once again, the weakest scenes were when he was with Medusa).
Auran is in name only. Honestly, I was fine with her as a villain. The lack of ears bothered me (although I was holding out hope for a while she was just covering them with her weird haircut). In the end, her powers were shown to be completely different so she basically has the same name and kind of same job title, so it's easy for me to pretend she's someone else. She would have been a good casting choice if Auran were in this show, though.