I liked the Halo show quite a bit. Unlike many Windows Central and Xbox followers, I didn't have much experience with the game (I mostly limit my scarce gaming time to open-world RPGs). So I went into the show fairly blind, other than knowing vaguely about the characters just because people talk enough about Halo that we all pick some of it up.
As a stand-alone action science fiction show, I thought it was very good (maybe not great, but at least very good). I think most of the negatives about it relate to it failing to meet expectations from Halo game fans, which is completely fair. I agree that writers should support the fans and source material, otherwise you get things like Star Wars: The Last Jedi (possibly a fine stand-alone piece for the non-Star Wars fan, but not a compatible entry with the rest of the series).
But for anyone who has not seen it yet, if you don't mind that it may not be well rooted in the Halo game lore, the show itself has intriguing science fiction mysteries, exciting action, and highly engaging acting by Pablo Schreiber as the Master Chief.
I hope Netflix does deliver a third season.