I <3 the old GBC Zelda games.
Currently playing Minish Cap. It doesn't have that same 'umph' that the others did.
Yeah, I'm thinking of getting one of them(the GBC Zelda games) for my GBC.
Also, there can always be improvement, new gameplay features, improvement on old gameplay parts, extension by way of new weapons, dungeons, bosses, etc, generally things to do. Deepening the storyline helps too.