The passion's good to see, although it's acted passion at the moment; there's no way he can be genuinely emotionally invested in the club, at this early stage (I love that Dick Dastardly "Drat and double drat!" air punch at 0:10!). He knows the cameras are on him, knows that one of the things a lot of Villa fans found objectionable about Paul Lambert was his inability to show much emotion over the course of a whole match, he's out to show he's not the same, and you can't blame him for that. Genuine emotion will follow for sure, because Sherwood has an open, expressive character.
From what I remember lambert celebrated our goals pretty passionately, probably because it was a long time in between them!