The music is excellent, the graphics are excellent and the story is pretty great. You'll need to do some reading, and pay attention to the environments, but it's there and pretty well fleshed out. Probably the best "You're the bad guy, actually" story I've played in a videogame.
As far as gameplay goes, it is *not* a run-n-gun freewheeling twin-stick shooter. Maneuver, positioning, and the noise your weapons make all matter a great deal, as well as tunneling through the level and controlling how much you're engaged with enemies.
The game itself is divided between the campaign, where missions are somewhat puzzle-like with fixed objectives, a selection of 4 vehicles and their attendant loadout; and the Freelance mode, where you choose your pilot (who determines difficulty), vehicle, weapons, and special ability, followed by choosing what maps you want to run.
There is a huge variety of vehicles that manage to minimize how same-y they feel even among examples in the same class. Generally larger, more powerful vehicles are less expensive and make less money on a run, while smaller vehicles are more expensive to unlock and have much greater cash-earning capability. Their guns run the inverse in cost, as smaller/lighter vehicles are far more dependent on an effective combination of weapons, while the really big stuff can have a single mount pull all the weight and combos are generally (generally! Not always!) not as important.
That said, the aiming takes a lot of getting used to, as ever projectile has moderate-to-heavy drop, fairly long flight times, and the targeting lines end about 4/5ths of the way to the point of aim.
