The gameplay and graphics I am not at all concerned about in the least, I mean its Bioware, but after ME3 I am not going to be negative but I am going to be very cautions of this new title. I am not worried about having stuff spoiled if I am going to spend my time and money on another ME game after what happened with ME3 I am going to make sure its worth it. Trailers and screenshots are great and all, they are meant to grab your attention, but lets look at the big picture here.
What about you guys?
Sure, feel free to do that.
But if you're going to youtube everything before you even consider buying the game, you'll essentially spoil yourself for every plot twist, character arch and development and the overall story before you ever pick up a controller, and thus don't have the option of actually making the choices presented in game and probably ruin the overall experience.
It would probably be wiser to get player reviews from players who generally share your same view on what they like or dislike about a game without getting the spoilers that comes with youtube.
I find my playthrough of a game is MUCH more enjoyable if I don't know what happens. For example, I went on a media blackout before Inquisition came out and refused to look up any more information on it because I did not want to be spoiled in any way. The result was me standing up going "Corypheus!!!" when he attacked Haven, and that battle had a considerably larger impact on me as a gamer who's been playing every Dragon Age game and all the DLC, and thus I knew exactly who he was from Legacy in DA2, and a much greater appreciation for Cassandra and Varric as companions.
It enhanced my experience in playing it, an enhancement that would have been sorely lacking if I knew all the details before I even picked up a controller.