Finished it today. It was entertaining overall but also very chatty, the show could have used fewer side plots and maybe seven episodes would have been enough. Some CGI and action scenes looked like fan films as I said before, some looked very good, it really was night and day from an episode to another just like
Moon Knight. Also I thought that Masterchief had his helmet off way too often but they were going in another direction than the games so maybe some people won't mind.
As far as fan service goes, I don't know the games enough to recognize everything but I did notice several aliens and weapons from the first game.
Also, Makee was a cutie.