A part of it is that it's funny and well made, the other parts is that the content doesn't have that "bullshit ad" factor, I don't know how to explain it, he knows it's an ad, you know it's an ad, nobody is hiding from it.
And you will find that 90% of comments under his video are saying the same thing I am here, the guy has essentially made watching ads fun.
(also, some of his Gin ads are hilarious, like his "Ryan Reynolds' Vasectomy" cocktail recipe)