I don't. Henceforth I don't accept the events in its campaign as belonging to the halo universe. To me it isn't Halo if not made by Bungie or 343.
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Halo Wars is based off of the Halo universe, by definition it is a Halo game. Was it good? Well, it proved that an RTS can be done on consoles if its ridiculously simple. Build spam of x unit to counter spam of y unit to counter spam of z unit.