Mad Penguin gives us a fairly thorough overview of the new OS. To sum up, he gives it a 2 out of 5, with this quote included in the closing comments:
To be completely honest with you (and this is not meant to disrespect Sun), I would not deploy this OS in any situation (other than maybe the most basic user) at this time due to these and a few other concerns I have. It is not ready for the desktop, though I see potential for it in the future if Sun continues its push for the desktop.
Read the full review here.