I kinda agree that DCS in general is lacking behind in the sound department comparing to the rest of the sim platform. Yes the sounds have been improved alot the last year or so but i still think the sound of the jets and prop planes could be alot better.
Most of the sounds used in DCS in my opinion lack what i would describe depth, atmosphere and immersion when it comes to sound. Now again im not a sound specialist im just thinking out loud.
Graphics wise and when it comes down to realism controlling aircraft DCS is absolutly the master of its domain. If the sound engine and the sample sounds are improved we are looking at the absolute KING of flightsims.
(Myself i use a ASUS phoebus soundcard in combination with a Beyerdynamic Custom One pro headset)