The 2004 mixes of Empire and Jedi sound pretty good most of the time. They are identical to the 1997 versions aside from specific changes such as Boba Fett's voice and some added sounds. The main problem with them is that the surround effects are consistently too loud compared to the rest of the mix. I don't know for sure, but I suspect that this may be have to do with the fact that films are mixed with the surrounds calibrated at -3db relative to the mains, since theatres use an array of rear speakers, while home video versions have all channels calibrated to the same level, requiring adjustment of the source to sound the way they should. It's possible that they may have forgotten to turn down the rear channels, which might account for the distractingly loud surround effects.

However, it is also possible that there was no technical error, and that the overly loud surrounds are simply an intentional part of the mix. If so, it would show a disturbing lack of good creative sense; but since the SE's as a whole are an exercise in poor taste and bad judgement, that might not be that much of a surprise.

By contrast, listening to the 1993 mixes through Prologic II yields rear channel effects that come out at just the right level.