I always dread picking up a new game that is kinda demanding on the hardware because I hate to keep testing all graphical settings to have the best graphics with good fps. The least they could do is show a split scene with each setting on or off so you can judge with your eyes, but a button that you set the fps and the game crunches some numbers and benchmark to find the best quality graphics settings it can do at the target fps.

If it can adjust the graphics on demand would also be awesome because some games can have variable demands during gameplay.