What's astounding is that there are numerous TV shows that have managed to have better production values on a TV budget.
Off the top of my head, here are TV shows that don't look as cheap as Inhumans.
Game of Thrones
Battlestar Galactica (2004)
Star Trek starting with Deep Space 9
Into the Badlands
Outlander
Legion
Once Upon A Time
Firefly
Strike Back
Spartacus
Sons of Anarchy
Stranger Things
Vikings
Black Sails
24
The Walking Dead
Sense8
The Wire
The Last Ship
Taboo
Marco Polo
Deadwood
Quantico
Da Vinci's Demons
And the trailer for Knightfall also looks pretty good for a TV show.
Yes, Starz, HBO, AMC, Netflix and FX usually have the best production values for series on their channels but that's not an excuse. The fact that Syfy and CW tend to have the cheapest-looking shows isn't an excuse to lower the bar either.
The fact is, it's hard to know what I'm looking at with Inhumans. The set design is awful enough to the point where it looks like unpainted sets, not a finished TV show. The show takes place on the Moon. Nothing about Inhumans screams, "lunar colony" to me. It doesn't look like a sci-fi series. It looks like it could be set in a laboratory on Earth. There is literally no sense of place. The CGI is being fixed but that's shown for all of a few episodes. The environments look terrible. That isn't helped by the lack of powers for the other Inhumans. Apparently they use guns. They're supposed to have incredible abilities, so why are they using guns?
The costuming doesn't look particularly good and Black Bolt lacks his cape and Marvel also cheaped out on Crystal's sleeves. Medusa's fabric also looks cheap and the shoulderpads are way too 90s back when everybody was ripping off Dragonball Z. Maximus should be wearing a Silver or Grey costume, not black. Triton lacks a rebreather when he's on land which is yet another knock on him. And Gorgon's costume also looks too modern. These characters don't resemble the Inhumans. They look mundane. Karnak is an exception.
Even Star Trek: The Next Generation gave Worf's makeup more texture than Triton in Inhumans. No excuses for shows made today since that show was made in the 80s.