At Free RPG Day, I got to game with a buddy who runs the local RPG con–B/X is his jam, and I love him for it.
He runs his somewhat uniquely, and there are aspects I disagree with (using a d8 base for semi-non-variable damage rather than d6), but there are others which I’ve stolen to make my own game run smoother (rotating initiative by side).
But the most important way he runs his game is that it’s fair–he’s not going to kick you when you’re down, but when you’ve goofed you’re done. PC death can and will happen in his games.
He’d run off some fairly wacky pre-gens from a site that gave stats and equipment that were all over the place. I ran a thief with 17 STR, 18 Dex, 8 Int, 18 WIS 14 CON, and CHA 4. Crusty Jim! I’ve learned from my own players and realized that Thieves have the potential to be the most stupid overpowered class, especially at lower levels. I cut my way through several orcs, bugbears, and giant spiders with my trusty Zweihander. With an AC of 4 and the potential to do over 20 damage in a single hit, I was a force to be reckoned with!
It’s also nice to play Borderlands without the moral quandaries that modernist gaming culture has tried to impose on it. We were told up-front: there are no orc babies; greenskins are creatures of evil that are born from, created by, and composed of evil and chaos taken shape. The goal was to kill them, rescue humans, recover treasure, and work to make the Borderlands just a little bit safer.
It wasn’t run straight from the module, but rather thematic, adjusted for a one-off. The keep was there, but we were given the choice to look for caves, small ruins, or large ruins (all home-made content). So I’ve still never played Borderland proper, but it was still a lot of fun cleaving through gobbos.