Thats an interesting point and I do have to watch out for things like that also. CSI isnt so bad but the opening battle scenes in RotS was more than I could take.
Depending on your TV you can do things like turn mpeg filtering way up that should help blur things a little. Of course that defeats the whole purpose of HD.
Oh and light saber battles are the absolute worst for me. Especially the one with... Grevious is his name I think.