It really is a perverse pleasure listening to all of the audio at the same time and trying to focus on just one film at any given point and pick out the dialogue.
I found myself really enjoying it.
Also, having them all up there at once with just the isolated score, you can really see how bad the lighting is on ROTS - it looks like 'Days of our Lives' or any of those daytime soap operas. You can also see how much more distracting the backgrounds etc. are in the new films, especially in key 'emotional' scenes there is stuff flicking around behind the players. Everyone seems more 'costumey' too.
Funny how many things really jump out at you when they are all side by side and there isn't any dialogue, you get a much better sense of the visuals, and surprisingly ROTS (which I enjoyed at the cinema) really looks sub par when viewed like this. The other films look relatively 'real' and ROTS looks like an old Star Trek episode except shiny...