I have said this before here but it is worth saying again I think. Just because a song is original it don't make it good but it don't make it bad either.

The same goes for older songs, just because it's old don't make it good either.

It would appear that the common understanding of what makes a traditional song, is that it's author is unknown or uncertain and that if the author is known then the song can't be traditional.

I don't think that it matters much if the song is described as traditional or not, it's the quality of the song that matters, not its pedigree or it's author.