First episode wasn't bad. They made the Elites way more frightening in 30 seconds than the games ever have, was totally not expecting that. I saw some stuff earlier in the week about how someone high up on the show (I think maybe the director, not 10)% sure) mentioned they didn't even bother to look at the games at all, which had me a bit worried. You can kind of tell, as the story isn't (so far) anything relating to the games. There's the Master Chief, the UNSC, the Covenant, Reach is a thing, there's other Spartans, and so far that's really it. Chief even takes his helmet off in the last 10 minutes or so of the episode, which I wasn't expecting.
I'll keep watching for now, I enjoyed what I saw in this.