I mean it was bad because that was the editorial mandate it seems.
There was a lot of great talent behind the inhumans push, and on those x-men books from that era.
The inhumans are just too weird to be the stand in for "hated and feared," class of the MU, and the X storylines were mostly rehashes of concepts barely a decade old (198 again!) that nobody really loved to begin with.
There's a lot of good inhumans out there, and those characters definitely belong (Medusa rules, I don't care what some dumb show had to do with her) in the greater MU and potentially the MCU, but I think it missed its mark because of corporate square peg, round holing.