Yes it is poor quality. Sounds almost fake sometimes and sound drops too
Sometimes I have a choppy sound (for 1-2sec) using headphones. But this is not Skyrim specific.
The quality is due to the developer. As the PC-section states, Skyrim hammered one core while all others were mostly just idling (before the update for Core2. Note, it still doesn't make a sophisticated use of more cores!). Personally, I think it is quite safe to assume that the ps3-version behaves similarly. Since the ps3 doesn't have a dedicated sound processor, this output has to be computed by the cell. Then, if you don't use it wisely you won't be able to achieve a good quality ... and have to turn it down to a level it is performing "acceptable" again.