Thank you for raising this - having only had limited beta testing time so far, the low / poor quality audio description has been the major issue for me.
I drive an open top car, and use Bluetooth headphones for the audio, as the wind and engine noise is (fabulously) loud! The clarity on MRA Navigation was excellent, and the beta test audio is a huge step backwards, so it is good to read that things will get better before it gets launched.