I use to like 'Acda en de Munnik' when I was younger. I find some of their lyrics quite beautiful/funny/recognizable although their music mostly is a cliche.
For the rest does 'Youp van 't Hek' has some nice songs in his shows.
And 'Boudewijn de Groot' and 'Doe maar' have made good music for their time (60ties/70ties).

At the moment is 'Volksweerbaarheid' the only Dutch band that I like.

And when speaking about Dutch traditional folk you come more to the 'smartlap-genre'; sea man music with sad lyrics and a slow tempo. Sometimes fun to listen to, but not good in my opinion. Well let's face it; we (the Dutch) are a nation of merchants and scientists (although we have some painters, architects and writers) with a lack of culture.