Fighter mission:
Decent. I wish there wasn't such a focus on DFM, but it's not awful. I also wish that the third person view was zoomed out a bit more. The old games gave you a great look at the sky around you. It's probably not up there with AC4 and AC5, but since there are so few air combat games, it's hard to be picky.
Helicopter mission:
Screw this. The chopper handles like I'm flying a 10 ton hummingbird made of concrete. Most sandbox games have a more fluid helicopter system than this. Halfway through I realized I didn't have to worry about touching the buildings or anything, because they have no effect. The barrel roll is ridiculous, and in order to do it, you have to hit the missile button for some reason, so I wasted a lot of missiles trying to dodge. It was also really repetitive and seemed to last forever. I got shotdown when the enemy choppers finally showed up, but I have no interest to play again to see how it ends. Not fun, not interesting... Just crap.
I'm not buying this at $60. Maybe when it drops down to the $30-ish range.