It's really jerky and doesn't seem like he eases in and out of the animation.
I'd play with the IPO curves and spread out the keys.
Try to have the IPOs go slowly then have them accelerate to where the key is.....
If your serious about animation buy "The Animators' Survival Guide".
I bought mine on Ebay for $8 shipped and it's a VERY VERY nice book!
It's animation principles,
not how to use a software package....