That is factually false, and many of the best games don't show the main mechanic first. I mean, Ocarina of Time is lauded as the best game by many and the first mechanic that it shows is how to target with the Z button. Is that the main mechanic of the game? No, it's one of several mechanics. The hilarity of thinking Fallout 3's main mechanic is speech checks when at release some people complained that New Vegas had too many. That is also factually false. Fallout 3 makes combat so much more prevalent to the point of the detriment of every other mechanic. I know he made the video for views, but the main problem here is that a lot of his fans are eating up what he says and think every point he makes is valid. To the point that in any debate about Fallout 3 after the video was released there's always at least one person saying for people to watch the video to see good arguments about why the game is good.