Meh, action scenes were pretty well-depicted in the old comics, I don't think the motion in comics has improved. Honestly, I find a lot of the artists that go for that uber-realism have scenes that look flat or stilted (Greg Land comes to mind).
And no, I dont think movie directors today are better than ones from the past. Stanley Kubrick's Apocalypse Now is still an amazing film to watch. I dont know very many people that will say Eyes Wide Shut was better. As far as technology goes, I think that's more equivalent to, say, the paper quality of a comic, than to the actual artistic process. Outside of that I dont see how visuals have improved in movies. If you mean stuff like CGI compared to stop-motion, then again you're assuming realism equals superior. I mean, Transformers 2 has pretty crazy visuals, but was mostly a cluster**** of nonsensical robot fighting. Terminator 2, another movie with robots, totally kicks that ****** movie's ass, in action sequences and story alike.
And while there is a progression, all of it is built on what came before. That doesn't equate to stuff now being better. Rap music has its roots in jazz and blues, that doesn't mean its an improvement of those genres.
Seriously, you are denying yourself stuff amazing films if all you're watching is stuff from this century.