There is a lot of fakes in game industry. Some of them:
1. Epic rendered trailer with extra awesome graphics and animaition
2. Cool posters also with awesome graphics
1. Yes you can spent millions on render, but as Skyrim trailer madden on game engine proof that real can be epic too.
2. 2D painted art is mostly better than in-game graphics. Especially it about icons in App Store. I simply can't judge game by icon at all. It better to have animated gif of game actions that such representation that take my time to click and see and than back
So stay real please