So, the review at ars has to be the best review so far, and the most comprehensive. I agree with Siracusa on every point he’s made about the user interface, especially the points about the transparent menu bar and the dock.
Just to illustrate the stupidity of the transparent menu some more, I notice that depending on the top 25 odd pixels of the wallpaper, the transparency will disable. This can be proved by looking at the following images:


Note the different shading of the menu bar between the two images? Even though they both have the same level of black behind them, one is darker than the other. The first one appears to have the transparency disabled by the OS, to make the menu more readable.
Why can’t we have a damn toggle for this to force it to be disabled?