Their problem is a lack of communications.
They could have said they found a issue in X, so we need to fix it before we release the drivers, and most everyone would understand.
Instead, they just throw canned responses.
They could have also released the drivers and when that specific issue is fixed release another set. These are all beta drivers anyway, so what does it matter how quickly they roll out new versions?
These aren't WHQL, so, they have no excuse for not doing release early, release often.