No, Shatner isn't himself! He hasn't really been himself since that transporter malfunction in the second Star Trek movie. Or was it the third? The one where he yells

KHAAAAAAANNNNNN!!!!!

quite loudly. Anyway, some key little parts of W.S. seem to have not made it back to where they were supposed to be and some little parts from someone else seem to have been substituted for them and, well, poor Bill just hasn't been the same since.