It's pretty neat watching/playing games with glitches, especially RPGs.
Even Skyrim has speedruns, apparently.
I religiously re-watch quadrazids team speedrunning HL1 all the time
Something about the sound of the weapons, music, and enemies going by so quickly is really great
>FO3 and FO:NV is open world, the former you can complete in a few short quests and the latter can be optimized for the fastest route.
Never played FO4 but it's probably more linear and requires you to do more stuff to finish the story, it will become something under 20min once someone finds the inevitable game breaking glitches.