Ya know, just as a test, try this:
You know how some of those really 'expressive' musicians make those funny (pinchin off one) faces when they are really into it?
The next time (alone of course) you are just messing around, try it. I mean, hit a note that you think sounds you are lifting a 200lb barbell, and make a face to go with it. Keep doing it! It works! Seriously!
Me, I'm normally like Mr. Spock. Emotionless, but groovin. But when I cut loose and start making the faces, I feel good.
That drummer, theatrics or real, certainly has the skills to back up his antics.
I like his style, over-the-top? Maybe, But he does back it up! Plus what he is doing is fun!