I liked some of the improvements to the enemies. Given that, I don't like the high tier brutes as on higher difficulties the can become almost impossible to beat without a precision weapon or a cheese. The weapons are cool, but many of the halo weapons from other games have been removed. The vehicle leave a lot to be desired. The story of the game is very short and the made up for that shortness with running time. Also the story start with you asking some question and then you will not get those answers.
Ok, I think the game has had some potential, and if it had couch coop, I would probably be happier with it, but the game is underwhelming I feel disatisfied. After the disaster with the last game, I was hoping for a story that would be engaging and fun, that had some replay value. But I don't believe this is the game for that. DLC that contains story content is of the utmost importance for the survival of halo. The multiplayer is very good but, I am not going to play the multiplayer alone.
TLDR: I am disappointend and don't plan to play the game again until there is some actual content to the game. But some of the enemies in campaign and different.