Tom Clancy's H.A.W.X. was heavily influenced by Ace Combat series. Unfortunately, creators decided they want more serious approach, which led to generic mission types (escort this, defend that) instead of craziness of Ace Combat.
Graphics still holds up good enough when you are in the sky (planes are gorgeous), but textures of terrain near ground is so bad, you'll try to maintain your altitude high enough all the time.
H.A.W.X. features leveling up system, which unlocks new planes and loadouts for them. But after finishing game on hardest difficulty with all "fun" challenges (aka kill "x" enemy with "y" weapon) you'll get only to level 27 of 40. And will stop there, because multiplayer community is pretty much not existent after all this years.
Overall, it is very far from the best games in this genre, but still enjoyable experience if you are open to forgive some flaws.