Good lord that subreddit is cringe. I don't have much of an opinion on Dunky, I've seen like 2 of his videos and have no thoughts other than his voice annoys me a little. I know next to nothing about the guy or his fanbase, but that sub, yeesh.
If you watch anything, watch Dunkey's gaming difficulty videos. I don't watch a lot of youtube, but those are genuinely great videos. I think back on some lines often, actually, when talking to friends about games and my favorites from the 90's/2000's.