I love video game trailers, but I love them for the same reason I love concept work: I see them as entirely separate art forms from an actual video game.
I enjoy them and appreciate them for what they are, not what they're trying to represent. And that generally leaves me a pretty happy guy! If, however, you look to video game trailers to sell you on a game and how it actually looks/plays, well...in the past five years you've been shit out of luck.
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As this diagram so eloquently explains.
Why I don't care much for teaser trailers [Reddit, via Gamefreaks]