Graphics have to be there to complete the game. Take games like Mass Effect, Uncharted or Heavy Rain where the emotion of the characters is very important, and that would only really work with brilliant graphics. Likewise, the scale of things in God of War III is very important for the overall feeling of the game, and it really does wow. Of course, these games aren't about just fun, but general enjoyment, there is more gaming than just "fun."
Of course, if you want to look at a game that is just about mucking around, then look at Just Cause 2. The graphics are key in drawing you into the game, and wanting you to explore. Being able to see these beautiful vistas encourages you to take a look and discover more of the game world







