HDD is horribly unfunny. Never cared for those who try as hard as they can to be "Edgy." Especially just out of the blue like the part where Twilight "Pleasured" herself or "My Dad makes me put glass in my vagina."
Furthermore, his parodies have little to no relation to the actual show apart from the characters and a single trait about them. Hard to make fun of something when you take away everything just to do it for a single thing. Admittedly the song in the shed episode was pretty cool though.