Matija Mandic wrote: "General home gaming has existed for 30 years now, since the painfully unplayable Magnavox Odyssey, through the ashes of Atari 2600 to the legendary NES, to pave path for the Genesis, SNES and numerous other home consoles to this very day. Presentation in games is what forges the first impression when starting it, whether it was by an interesting story, beautiful graphics or most importantly, addicting gameplay, and it always depended on the system’s capabilities and the control potential. Back then in the era of Atari and NES, graphics were never the best way to immerse yourself into a game, but they served as somewhat of a mind fuel - looking at those barely rendered pixels in all of their 8-bit glory, along with the sound effects that nowadays sound like dubstep background noise, made the imagination of the player do all the work."
I've also thought that more eye-candy rather than pixels have taken away a lot of our imagination, that we once used to shape the rest of the images in our heads.
But in terms of presentation in games right now, it's mostly about the 'cinematic feel' and as long as that's what developers are trying to achieve, i think games should become even darker (in graphics) but ultimately i think it's better to leave a lot of it up to the players' imaginations.
That's why pixel-ish graphics are still used in new games (mostly indie-games) like Minecraft, Fez and Resonance.
A lot of game have become ''darker'' but they are indeed trigger to an inmature audience such as Gears Of Wars while games very colorful and cheerful like Rayman Origins can be more ''hardcore'' in gameplay.
Should Mario be darker? Probably not. How do you make a racing game or a puzzle game darker?
If a game is made with a dark tone, and it's done well, there's no reason to complain. But a few games doing it well doesn't mean that, suddenly, more games should follow suit.