The content in question is the very engaging (and slightly complex) Metal Gear series.
Is the Sisyphean mission of Solid Snake — to rid the world of a robotic nuclear tank called Metal Gear — a parable about the futility of war or about its necessity? A critique of America’s domination of the global stage? A metaphor for the struggle between determinism and free will?
Others object to the sheer density of the story, spanning seven games released over 20 real-world years, that players are asked to master [emphasis mine]
PS3 Fanboy adds:
Just as films have evolved into an acceptable means of telling a full, gratifying story, it won’t be long before video games achieve the same distinction.