I'm reading some of the reviews and I can't help but think that this Halo series is suffering from some of the same issues the new Star Wars series experienced. People are too upset about how the games were much like the Star Wars fans remembering all the nostalgia of the original movies.
I think anyone who goes and watches this show should enjoy it for what it is. You won't experience all the same things a game can magically create. A budget limits your capabilities but to be honest I am quite impressed with what we've been given.
Sure, Master Chief's face is shown. It's hard to build a connection to a character without seeing him. There are a few other changes from the games that this series has done and I'm embracing them. The show is awesome so far and I'm excited for where it will ultimately take us. Just take a step back, realize this isn't the game, and enjoy this awesome universe that is coming to live action.