In the SCUBA showcase, it was way too easy to be detected by enemy AI. Slow prone the whole way in a valley covered in high grass and yet they still found me (they weren't even patrolling) and immediately engaged me. There should be a degree of 'stupidity' amongst the AI that they can't seek out players in a microsecond. Sure, it provides a challenge (which is why most people play ArmA) however, in the end it is still a game and 'impossible' shouldn't be a feature within it.
Thanks!
PS - Other than that, the game is a amaaaaazing. Thank you.