Ye gods, never have I seen so many pedants and arses all in one place. I think you've got a point - yes, there are exceptions, though many of these often prove the rule - 'Destroy all humans' is a satire on old guard B movies, looking from the evil aliens point of view to offer a change and poke a few holes in one of the more fringe hysterias to come out of the cold-war era (The clues in the name fellas...)
Human-centric plots are used in the main by all mediums not only because its safe and easy for the viewer (which, lets face it, in gaming is more essential than in any other medium, what with so many of the target audience being mysoginistic homophobic adolescents that can't get their head round people having a different skin colour, much less sentients of a different species altogether being anything other than disposable fodder for their next space marine crusade; I invite anyone who doubts this statement to play an online game that features voice chat for a couple of hours...).
The other problem is its a ball-ache to write. If you want your aliens to be truly alien, you have to come up with stuff that goes beyond being analogues of human stuff (otherwise you end up with Star Trek), which means if you want your audience to have a clue what's going on you either have to explain everything or present it in such a way that they are content to go along for the ride, not necersarily fully understanding all thats going on. Its been done, a good example is 'Look To Windward' by Ian M Banks - all the characters essential to the plot are either AIs or aliens.
hated playing as him, was just so boring.
