Realistic animation is my book, is when the animation becomes where as if you were stalking a dude, but he's made from lego.
So the most realistic animation in my opinion is Nathan Wells. He animates where as the figures move clearly and very crisp. I also think that Hazzat has some great animation, because his figures moves and acts upon a personality. So you can really connect and get a clear inference opon his performance. I also like ZachMG, because of the way he makes them move, it's just one smooth motion with a bit of emotion.
Nathan Wells: Clear and smooth animation. Humanlike.
Hazzat: Intruguing and entertaining with a great deal of personality. Theaterlike performence.
ZachMG: Portrays motion with a sense of technique. Good timing and well thought out motions.
Personally, that's what I think. 
ololI rearwy, rearwy like dinosaurs. Or something...