Halo Wars had one game, and while I thought it was pretty good, it's hardly a BELOVED STRATEGY FRANCHISE.
Age of Empires or Bust!
Definitely Halo Wars. :V
Kinda off-topic, but I remember Halo ODST being pretty great. One of the best campaigns in the Halo series IMO.
Agreed, ODST was a nice game, and the horde mode rip-off was fun.
Also the ODSTs in Halo Wars were the most fun unit.
"OD-OD-Hellju-OD-OD-Hellju-Hellj-ODST's Reporting for Duty", and seeing them snipe people inexplicably with shotguns.