For those unfamiliar with the nickname, Tog (Bruce Tognazzini) is one of the original Macintosh UI designers and is still considered to be one of the finest authorities on UI design available today. After long avoiding posting an official review on OS X, he has finally done so in this Panther review.
The review is not exactly a glowing review, except to say that he now feels that OS X is a worthy successor to OS 9, finally. Those who have listened to Tog speak in the past are familiar with his OS X complaints, including the Dock, screen real estate waste, and speed. Turns out that he still has a lot of nits to pick about Panther, but couches them as free advice to Apple instead of a list of complaints.