Ouch... Not so good. Not so good at all.The background and gun sprites look great, the music is well-chosen, but this animation is seriously lacking. Though the animation isn't choppy, the movements are very unrealistic, too fast, and completely lack easing and pauses that are necessary for making movement appear realistic. On top of that, the dialogue is mediocre at best.
Anyway, I think the best way you could improve your animation is to try animating someone standing still, then gradually start walking, then running, then sliding to a stop and maybe jumping. Try and capture the essence of movement and physics in your animations.