One more vote for the original Doom, running in a modern engine with some of the colossal WADs released over the years.
It loads instantly, gets you fighting in no time. You know the rules, yet you still get surprised by one of these guys with a machine gun.
Compare that to a modern game, where you have to wait for it to update, compile shaders, the studio logo video, the proprietary launcher and the main menu before you are allowed to do anything.
E1M1 but rendered on a SoundBlaster AWE32 in full MIDI glory.