I really enjoyed the first Halo Wars game (the story, anyway). However I wish it were more like what was shown in the video below, because the base building reminded me of Command and Conquer.
I played the Alpha or Beta or whatever it was for Halo Wars 2 the other month. It was okay, I'm not sure if I'm going to buy it or not. After 343i took over, I lost interest in Halo. It's not the game-play that ruined it for me, it's the story and art style. I understand why it changed but I still don't like it.