system
A chat on subreddit /r/pcmasterrace
human
It's never like this. I can't remember a single game thst looked bad in trailers or had a horrible demo and turned out to be good after release.
gpt
Doom 2016 is the only one I can think of that comes close. It didn't have a demo that players could play, but the trailers and videos of devs playing it somehow made it look very bland. 

Then on release, people found out it played a hell of a lot faster than anything shown until then.