They did the look perfectly, it looked and feels in the action moments like the games. Which is... I'm sorry to all you novel and lore fans... the main point of adaptation for the majority of Halo fans. Its a game.. its a TV adaption of a game...
But for everything they kept to keep gamers happy, they changed to try and make new fans interested.
I think this has failed. Its too different from the game story to keep us gamers happy and its too weird, a bit corny and a bit on the nose to make any sci fi fans new to the franchise see it as anything special.
I'll watch it. But as a halo adaption. It kinda sucks.