It's more of the same Ace Combat action. The flying is simple and easy to pick up. There's little "simulation" details to fiddle about with, so the emphasis is firmly on having fun.
The graphics are excellent with beautifully detailed aircraft and reasonable ground detail.
I don't find the Ace Combat games great to play for long periods, as the missions can be quite samey. i.e. You're in a plane, you shoot things. But what can you expect, platform sections? :-)
But for a quick high-adrenaline blast, Ace Combat is great, and until they do the sequel to the fabulous Crimson Skies on the 360, this is the best flyer there is on the platform, IMO.
Only three stars as it's not a game to grab and hold you for days and days.