Since the dawn of civilization, mankind has been establishing pyramidal structures, where some people are on top, by standing on the shoulders of others. Or, as Orwell said, "If you want a vision of the future, imagine a boot stamping on a human face - forever."
I don't think the problem is more autonomy for MPs or better Parliament, because those are symptoms of a problem, which is the fact that our society has a tendency to establish undemocratic structures, and only by remembering what real democracy is, and not giving up on our freedoms, can we make a balanced system.
We have to remember that the nexus of the ideas about how First past the post is the most efficient and democratic system, because we live in a "complex, oh so complex" world, come from those in power and from the status quo, which doesn't make it democratic at all. Proportional representation is not necessarily the best system either, if we forget where democracy comes from, if we forget that we have a voice.