I am with Schruem with regards to the timers.
I played the first mission or so of Ace Combat 6 and the first few missions of HAWX and enjoyed the missions more.
I have really enjoyed AC7, played through the campaign fully once and about a third through a second time so far.
The other factor that would have upped the enjoyment, or at least engagement in the fights, would have been far less drones and more aces to fight. While drones have the ‘faceless emotionless implacability’ factor to them, it just doesn’t have the same feel as fighting enemies with character.