From that vid it looks like you should give attention to smoothing out your motions. There's a sortof interrupted flow of movement between bringing the rifle up and then moving it to the final position. Again, I'm unsure how much control GMAX gives you, but it's something to focus on. If you figure out the curve editor, it'll be very useful for that purpose. Managing time between keyframes is also important - if you space apart movement-only and rotation-only frames in places where you might normally have them at the same time location you can get much more fluid motion without necessarily slowing down or speeding up your animation.
Epicly useful post there.
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