You ppl may laugh but post fx is really a big selling point for indie developers. That's something that I really like with UE, Stingray and even S2. Bloom looks very nice to the eyes, eye adaptation although not very realistic makes your game to feel like a big budget, scene/color fringe is a must these days (Kane & Lynch anyone?), and of course DOF. And many engines now have option to even color grade your scene.
I know that game play is what matters, but I am now speaking about aesthetics only. Recently I was playing with S2Engine, and have to say that has really nice post fx inside of it. After turning them all off, whole scene looks, meh...
I would really like to see post fx in LE on higher level of quality, like Unreal has and other trending engines.