Slate's Seth Stevenson gives a thumbs down to the new Mac ads:

In the case of these Mac ads ... I'm smack in the middle of the target demo. I'm a PC user, and I've often considered switching to an Apple. Thus, I feel equipped to say: These ads don't work on me. They are conceptually brilliant, beautifully executed, and highly entertaining. But they don't make me want to buy a Mac.
Astonishingly, it turns out the PC is played by John Hodgman.