There's a saying about experiencing something a second time like it was your first, or whatnot. Can't think of it now. Doesn't matter.
If you haven't played "Brutal Doom", go do it. I can't express how amazing it was. It was like rediscovering doom all over again. I still remembered most of the stages and secrets and traps, but the Brutal mod just reinvigorates the entire thing. It has more satisfying "punch", and gore and action and just "aaaawwweeee shiiiiiit" than I could count. The best part is that it's just fluff. They didn't make custom levels or non-canon bullshit. It's just Doom and Doom 2, with just enough updates (mouselook) to be completely playable today, with an amazing attention to detail on new, and more, gore effects.
It. Is. Awesome. It's been years since I've laughed out loud because I was having so much fun with a game.

Brought back some great memories for me. Played this game so many hours it now comes back to me as a segment of my life.

I wished Brutal Doom worked in Doomsday. I can't stand sprites. I played John Romero's E1M8 with it last week. It was SO fun!

I wish I could watch this video to the end (made it about 15 minutes in), or even play the game, but unlike in my younger years, these days I get cold sweats and nausea from most first person shooters, and sadly, Doom seems to be particularly bad for me. I'll upvote in any case, though, for the nostalgia.

The game was too immersive for you?