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Who's talking about nostalgia dubs? I didn't watch Digimon as a child, but generally I'd catch the opening theme, which I was referring to when I mentioned the catchiness.
Though, I do watch nostalgia dubs on occasion, generally for laughs. Pokemon has these, and One Piece as well. Then again, I can't particularly say either of those dubs were truly bad for their voice acting, with Gourry playing Brock, Martina playing Jessie, Veronica Taylor/Amelia playing a number of characters...don't really know why I'm going the Slayers route with this. I mean, it wasn't great, and the side characters then and now are pretty hit-and-miss, but it's biggest faults were mostly writing hiccups and localizations. The theme songs weren't that bad, either, and they clearly put a LOT of time and money into creating localized content for Pokemon.
...Well, One Piece had quite a few problems, but I didn't mind the VAs at the time. I still hear the 4Kids cast when I read the manga.