Ace Combat: Assault Horizon. While the AC-130U, Bomber and Helicopter stages are interesting aideas, Dogfight Mode controls like ASS. It's a horrible idea, every engagement gets so close-in compared to earlier titles (Even before you use DFM), and the plane controls aren't smooth at all; it all gets rather sickening.
Final insult; with several enemies, if you don't use DFM, they turn on a fucking penny to avoid your missiles and gun targeting reticule. So when that developer said it was completely optional, they were lying through their teeth.
Well, I guess it is 'optional' in the Hobson's Choice sense where choosing not to do it leaves you stuck until you say 'yes'.
The ground-attack variant of DFM (I forget what it's called) isn't anywhere nearly as bad, but the majority of your targets seem to be in the air.
The only reason I am going to play it through to completion is because the soundtrack is nice and in the game there will occasionally be a few fleeting moments where it does feel like an earlier Ace Combat when the enemy AI decides to behave like it used to, and my missiles arc towards and blow up their plane without having to deal with DFM or previously mentioned cheating computers.