I'm a FAA CFII who has lost my Medical , so I fly a lot of IFR on my simulator.
Three areas that need correction for MORE Ultra-Realistic FS would be:
!. Correct ATC heading language - i.e., TURN TO 000 is NOT correct !!!! It should be TURN to 360.
2. IF ATC clears you for an ILS, You are cleared to descend on the glideslope, don't keep telling me
to climb back UP to a previous Altitude.
3. ALL ATC headings should be proceeded by , TURN RIGHT to the heading, or TURN LEFT to the
heading, i.e. TURN RIGHT to 090 or TURN Left to 270.