Graphics are one of the big things that make the game sell. I don't care about graphics if the game is good but to those who've never heard of Elder Scrolls, the graphic appeal is there, subconscious or not. After playing the game, you can appreciate the game for what it is but before that, you look at graphics because you've never seen the game and only seen the trailer.
That's why the Skyrim trailer shows the beautiful landscape, which showcases both detail of graphics and the new graphics.
Of course, to people who've played Elder Scrolls games and knows the awesomeness of them, graphics really don't matter. Besides, if you're on PC, you could always just install a texture pack.