HISHE (How it Should Have Ended) is a staple of YouTube culture that's still incredibly funny 12 years on. I've been a fan ever since they released the Pirates of the Caribbean: At World's End video. And I've been watching all their videos ever since then! Are there any faults to the series? They do tend to neglect some truly classic movies, usually favoring modern releases to spoof: Rogue One, Ant-Man, The Force Awakens, Logan and so on. They could parody Citizen Kane if they wanted to, or The Godfather; even 2001 if they felt like it. But I guess Daniel Baxter is allowed to have preferences what to do or what not to do.
Give the series a watch. But you should watch a video of a film you've already seen. It's best to watch the videos when you're familiar with the subject at hand.