Re: Originality ...
"Once you are bored with FPS games, they are all going to look the same, in much the same way as action movies, especially if you ignore the plot"
Maybe that's the mistake being made; the plot.
I don't play much anymore, but I recall finding Medal of Honor (the 2010 one) so dull that I never went back after the first hour, but since then I have replayed HL2 at least once. Spec Ops:The Line held my interest, again because of the unfolding plot.
The differentiator is engagement, which relies on plot and characters and making me care. I don't play FPS games because they look pretty; I play them if they're fun, and eye candy isn't actually fun. Eye candy is icing on the cake, sure, but it's certainly not enough to make up for a game simply not being engaging.