I would not say it S*cked, but it is lacking reporting, and flexibility.
We were using Unicenter TNG SDO to push patches and SUS has made the job much easier (1400 machines). It is just a pain to track the failed installs using 3rd party tools, TNG AMO and the MS MBSA.
Besides wanting to see if anyone has had first hand experience with the WUS Beta, it is also an attempt to find someone willing to "share" a copy that I can try in a test lab at work.......