I'm always amused by people who speak of a new video game with seemingly great authority, when in fact it turns out they only watched a trailer or maybe a bit of a gameplay video, plus read some user reviews. The same goes with movies.
@Kaarme The best is when they out themselves by getting a point wrong that would be known if you played it, even for only 10 minutes, but not if you've only watched it. Like something that looks like a button mashing hack and slash from an observer's point of view, but it actually demands very precise and deliberate command inputs to do those combos, not mashing while holding directional inputs.