The first thing you'll notice with Halo Wars are the cinematic cut scenes that are beautifully rendered. While during the missions the cutscenes use the in game engine, between missions you are graced with some of the best looking CGI scenes to date. They perfectly fit the Halo atmosphere and canon. You'll be itching to jump into the game, but of course, not before the tutorials.
The tutorials were actually kind of a disappointment as they really don't show some of the subtle touches that Ensemble put on the controls. You get your basic cookie cutter tutorial here.