If you are referring to the original DSD, I find it's phase 1 demodulated audio dynamic range & quality quite good (realistic), albeit lacking a little in high frequency audio response.
DSD+, on the other hand needs work. I find it's recovered P25 phase 1 audio quality leaves a lot to be desired due to virtually non-existent dynamic range. Personally, I can't listen to DSD+ for any more than a few minutes at a time, but that is just me. I don't have any phase 2 or DMR, so can't comment on the audio they produce.
Of course, I will get shot down in flames for writing this - Gift horses etc.
Credit where credit is due though, DSD+ has opened up a whole new world of digital voice monitoring for many.