It moves at a constant speed throughout which is probably why it looks so weird. There's not really much noticeable difference in force like there should be. It goes from one area to the next, fluidly yes, but without much real style/interesting movements that I would care to look at.
Oh, and when you import your FP Arms...make sure you check "Import nodes as bones."
Also: Select Nodes>Right Click>Properties>Uncheck "Renderable"