I loved most of the Dogme files - including the idiot, Festen and a few others. Not at all unwatchable, but certainly uncomfortable.
In my opinion, great art and great entertainment are two independent dimensions of filmmaking. Dogme films were (imo) great art, but difficult entertainment.
I had to stop watching that sort of thing after von Trier’s Dancer in the Dark (not a dogme film). I felt awful for a week.