Not true, games, like movies, books, and other forms of media, are dynamic. Watching a video of a guy playing two minutes of the game will not give you a true feel of what the game is like, only a first impression. Reading a review of the game will, if the review is written well, give you an opinion on the game, key facts such as graphical integrity, settings, mechanical stability, ect, all without ruining the game's plot.