Because it was completely different from the series' previous installments, the announcement of Halo Wars initially worried some people. Traditionally, it would be a bit weird to find a real-time strategy game on a console. The genre just doesn't work out like it does on a PC. Surprisingly, Halo Wars did.
I'd go as far as to say that Halo Wars is the best RTS game available for a console.
Now, that's an angle I know you haven't seen before.
Ensemble Studios succeeded in creating a game that "felt at home on the console." Halo Wars had solid gameplay, responsive controls, and an entertaining story-line. The game even brings its very own, epic Halo soundtrack.
It's both visually appealing and immersive, and it paints the Halo Universe in a way that we haven't seen it before. All in all, a solid choice.