As someone who watches Board Game Geek's Game Night!, I know I am not a particularly normal consumer of videos, but I do understand what TableTop is looking for. To be specific, Tabletop looks for games that will be fun for the general public to watch, and that requires that the game do some combination of being simple (Roll with It), encouraging discussion among players (Catan, Coup), and looking pretty set up on a table (Carcassonne, Five Tribes). Dominion is really only entertaining to watch when both you and the players understand deeper strategy-spaces of the game. Without that knowledge, Dominion is (and most deck builders are) incredibly abstract and solitary. Tabletop needs games that are played out in the air, not in players' heads.
Legendary: A Marvel Deck Building Game had the advantages of being a cooperative game (assuming one takes it as a cooperative game, anyway), thereby encouraging discussion and collusion amongst players, and being a licensed product which will, whether fairly or not, naturally turn some heads.