Most everything I was going to say in reply has already been said.
Ian, your attitude on the subject pangs of an old man waving his cane in the air, screaming, "Why, in MY day..." when he doesn't even know what he's talking about because he hasn't experienced it yet.
Be honest, were you upset about Metroid being made into a FPS on the GC? I know there was a whole assload of people who pitched a fit about that and, with your current attitude, I wouldn't be surprised if you were one of them.
And I have bad news for you: Metroid Prime IS a FPS. Is the game viewed from first-person? YES. Do you shoot things? YES. Then it's a goddamn first-person shooter. End of story. FPSs have auto aim options as well, some of which barely require you to be aiming at the target and still allows you to hit it, but that doesn't change the fact that they're FPSs. Metroid Prime is a FPS geared toward exploration, but that doesn't change the fact that you fight your enemies by shooting them from a first-person perspective.
The argument of "I DON'T WANNA HAFTA AIM!!!!!" is a horrible one. Seriously, Metroid is not Unreal Tournament, not because they have different aiming schemes but because the two games have completely different focus in terms of gameplay, strategy and technique.
And you had to do plenty of manual aiming in OoT, including the last boss, the horse riding, solving puzzles, etc. No one complained about that, either. On the subject, Mario is a plumber who crawls through a lot of pipes. Samus is a bounty hunter who, to my recollection, has never actually been paid for bringing in a bounty (maybe in one of the 2D Metroids, but never in the Prmes). Even the f*cking StarFox team stuck with its guns and turned down the chance to join the Cornerian army because they're freelance mercenaries who GET PAID (among the list of offenders in the Nintendo universe is Captain Falcon, who supposedly catches all these criminals and yet we've never seen him do anything but race. A guy who never gets out of his car like that should be much fatter, IMHO).
You're overreacting. You haven't even played the game yet and you're already denouncing it, claiming it violates the "Sacred Metroid Testament" or some other such nonsense. At least PLAY the damn game before you blast it all to hell.