I do think the stakes of the situation matter. If the Doom demo just had a guy one-shotting a ton of demons, I'd probably find it boring. But the high-stakes demo they did pretty good job of reminding me of my experience of Doom in the 90s. I know what it feels like to be down to 10 HP and absolutely desperate for a health pack, you know? The feeling I got from the Dishonored 2 demo was that they wanted to show off a lot of the mechanics, but there were no stakes. The MGS5 demos are good examples of how to demonstrate mechanics around high stakes. Snake is constantly getting the upper hand, but he has to first find himself in a sticky situation before getting the upper hand. A movie analogy would be Jackie Chan films. I find it really boring when some badass guy in an action film just destroys his opponents with ease because it feels like there are no stakes. The movie is just spending all of its time saying "This guy is too badass to have any problems with these guys". On the other hand, Jackie Chan action movies constantly had Jackie finding himself in the worst situations that he had to fight his way out of. He was constantly losing the upperhand and having to struggle to get it back.