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No, it's not a bad idea. The dub version of DBZ isn't nearly as bad as most people make it out to be.
The filler can be a bit much however. I've got all nine seasons of DBZ and have rewatched all 291 episodes at least three or four times and I can bare the filler though it does get tedious and redundant a lot.
The issue I always have when rewatching it whether to listen with the digitally remastered 5.1 Japanese music or the stereo broadcast American soundtrack. The Japanese audio sounds much better quality wise, but American soundtrack is so much more fitting to the scenes and battles.