I kind of understand, appreciate and even praise the effort put in brutal doom mod. It's a well done mod, has a lot of attention to detail, it looks very polished. It really looks good, there's new animation added to old sprites that actually merge well. And it's cool to see how far the old game actually can go (even if technically it's not the old game at all).
But I thing is, it is no longer doom, actually. It changes gameplay a lot. In the previous video, it is said that the mod has a "purist" mod... and we see doomguy curse and show his finger.
You're obligated to have vertical mouse look on, because sprites have hitboxes you have the ability to aim now.
Another complaint is the sounds are to loud and generic. And graphical effects are a bit over the top.
That being said, I must say that vanilla doom actually looks a bit dry after I started playing it with beautiful doom, which adds more gore and animations but keep gameplay intact. But i still prefer it over brutal doom.