Going off on a tangent here, but from the distant memory of my film studies degree days one of the reasons you get so much fast cutting and hard-to-make-out action in modern fight scenes is because choreographing and shooting a fight scene properly is hard work, particularly if your actors aren't that experienced in stage combat. It's a big cheat, designed to make shooting fight scenes much easier (this is especially true if you're shooting a fight-scene where one participant is CG'd in).