Just played the demo and don't think it's my kind of RTS. My first ever RTS was Settlers and now I realise deep down I always look for those resource gathering kind of games, watch my empire get bigger, see those cool building animations, be a passivist and then when I'm accidently big enough crush my opponent or turn on my allies. None of this is in Halo Wars, but that's expected since Halo is an action game....still would have been cool. In Halo Wars I usually ended up selecting my entire army and x-ing and y-ing the enemy. The graphics are really cool though.
Everything feels very Halo (graphics, art, menus), except for the music (Bizarro Marty didn't do a bad job, but he's not Marty) and the stupid Uncharted voice for the main guy. Does he need to be in every game? Can't stand his smug all-american voice.