As the tutorial says, you need anticipation and following through on the movement. But, there are a few other things you need to do. One of those is direction. If Minifig A hits Minifig B to the left, Minifig B should be knocked to the left. To give the illusion of force transfer, you need to make the swing porpotionate to how much the minifig is knocked back. A forceful punch makes a minifig move more that a light punch.

Well, I kinda have some experience with that...

First, I start out with a basic idea for what I want in the fight, have a couple of specifics or two, but never plan it perfectly and leave loads of room for improvisation. Like how the fight might be generally sword fighting, and at one point it'll have an explosion.

Then I build the set, making sure it have enough room to do what I want, and a bit more, along with some props which will work for what I want. in (Enter Vladimir Vango) I wanted to finish it off with an explosion, so I put a box of dynamite in the corner. In How to Not Rob a Bank (still not finished with post-production) I made sure to put some couches in there, because I wanted to have someone be dodging a mafia boss with machine guns, and the bullets hit the couch and make white fuzz come out.

Then make the fight, just try to do what ever you think is best, then just connect the dots so that the pre-planned things you've thought up can happen too. And try to keep it interesting.

Another thing, FancyPants mentioned on his Force Unleashed topic, which is one of the greatest fights ever, that for some movements where he wasn't exactly sure about them, that he took more frames, because it's much easier to delete frames than to make them magically appear.

Any specifics one what's troubling you?