I really don't care much about the bar path at all since I am not an Olympic lifter. It's the velocity curve that I think will be the most useful, though I have my doubts on it's accuracy. However, it's the trend that it shows, not the actually velocity that matters to me.
Yeah, there have been doubts as to the accuracy on velocities, but as long as you have an idea of relativity within the movement I think it should be a valuable asset for PLers and/or WLers.