Now that I'm more awake, I'll provide a more in depth answer.
Literature and Video Games are different - games have just entered the on an art form, stories are probably one of the most ancient art forms around. But how does a game compare to a book, on terms of plot, lets actually compare 2 to try and make it fair. Far Cry is known to be a very good game, with lots of brilliant reviews etc. and lets take a piece of literature to compare - I started reading one of David Gemmel's book - from his Troy series (Shield of Thunder) - I've not even picked a top writer (apparently a good fantasy writer, but the book I've got has come very late in his career) Far Cry takes you from the point of view of Jack Carver, who is sailing in the tropics when suddenly blow out of his ship and his friend missing - he washes up in a cave, gets out by sneaking passed a couple of guards and this is where he is discovered by an employee through a device - they talk, he wants Jack to help him and he'll help Jack. Thus he has to follow a few mission for this guy - shoot lots of mercenaries, avoid helicopters, gather info and eventually uncover the unnatural activity where people have been experimenting on creatures that prove problematic. The story there - it's main plot unfold, is those creatures, right? These sort of enemies are common play in FPS games, Resident Evil had a few once you got over the zombies, same for Doom 3, Prey had them, FEAR, Gears of War, it looks like Bioshock has them too, but I've not played it so I can't say- all examples of regurgitated material, that have been done repeatedly in a very short space of time in some leading titles.
So plot lines aren't exactly brilliant for these sort of games, but what is it about these games that immerse you? Nothing really to do with the plot - yeah you want to be find out what happens, but how interesting are plots, how deep are they for you? How well do they work? Is it the action and gameplay that immerses you and not the story - is the story just there to justify a means? If you're blowing up mad creatures in the coolest way possible, there needs to be a reason - some linear plot-line to follow through in order to progress the game? That's probably why the plots aren't always that great. But in a computer game, where can plot work? Well if they think about it a lot more, if they've put more effort into coming up with ideas - using good and effective twists, keep forcing the player to asks questions other than 'what happens next' and make the player care about the plot more. How do you get somebody to care about a plot - this is where literature thrives, connecting the characters with the reader, have the reader care about the character, the people in their world.
So lets take Shield of Thunder - well I picked this book because it's something a video game has the potential to achieve - it's a journey you may find in an RPG, but the characters have moments of reflection and interaction, where the reader is attentive of what the characters are like - in this the two main characters have their own 3D personalities, one is more abrupt, quick to act yet not so quick to think and the other is a reflector who thinks an awful lot with an eye for justice, so he manages to get them in trouble, then at the same time is smart enough to get them out of trouble. Between these characters you get to learn a lot about them - their past, what they've been through and where they're going. You may learn things from other characters about them, their female companion you feel sorry for because she is human, like the rest of them and displays a range of emotions, holds doubt and can see where she can put her. The writer used Odysseus as a character, who has managed to reveal a few things about the reputation of other characters - sort of a device. Of course I'm saying nothing about what happens, because it'd be a plot spoiler.
So here you care what happens to the characters, because you can become emotionally attached. To be frank, if Jack Carver dies, he dies, do I really care? If one of the characters died on the novel above, like one of the main characters, I'd feel disappointed - yet curious what it means for the plot.
Of course, there are some really good plot games, Final Fantasy VI, VII and VIII being my favourites for it. And they've got pretty close to the depth a novel can go into - but there are so many things in a book that are difficult to replicate else where, especially with games, given their current standard. Books are less interactive - but you don't need to interact to feel emerged, because books can put you in the centre of something and feel you're there more effectively that a game - I think with a game, though interactive, you still feel as though you're a spectator, in a good book you can feel a bit closer than that.
Given for a number of readers gaming hasn't replaced books - I like to play games, I like to read. I think you'll find the gamers who don't reader and those who don't like to read. Society doesn't seem to emphasise books as much as games - but people still read a lot of literature and a lot of it is fantastic a lot better than any game.
"Experience never provides its judgments with true or strict universality; but only (through induction) with assumed and comparative universality." - Immanuel Kant
