You have to be joking ! The arrogance that you have is unreal ! What an amateur. Before you start criticising Chopin here, I am certain that you could not compose anything like a Chopin piece. Never mind fantasie impromptu. If you were any sort of pianist or enjoy piano, then you should be respectful to (controversially) the greatest composers! :/
You have got to be joking. I have no arrogance, as I never said I could write something better. And yes, as an 18 year old with no plans to pursue music as a career, I most certainly am an amateur. I'm glad you noticed. I'm pretty sure most people on this board are amateurs.
A piece of art is not judged by whether or not the critic could do better. If it were, artists would never be critiqued. For instance, I know when watching the Olympics that someone attempting a triple backflip who ends up landing horizontally, rather than vertically, is a pretty awful diver. I doubt I could do even one backflip, but that's irrelevant. If you put yourself in a position to be judged, you cannot be offended when someone does just that (although, even Chopin seemed to recognize what an awful piece of music FI is considering he never published it, so I guess it's not fair to judge him too harshly on something he never offered up for judgment).
And yes, I do enjoy the piano, but I have no more reverence for Chopin than I do for my dog. He was clearly a talented composer, but I do not hold him (or any composer) on a pedestal, and as such, I judge each of his works on merit, not on "Well, Chopin wrote it, so it must be amazing."