you know, I'm not sure why I bother to refute this in detail, because reading all your posts in this thread it's pretty obvious you're not going to listen to anything but someone agreeing with everything you say. "action adventure" is such a stupidly broad label it can be applied to pretty much any game except strategy games. The fact is the way you interact with 80% of the environment in the MP games is by shooting stuff. Whether it's shooting doors, shooting switches, shooting enemies, you spend more time shooting stuff than you do scanning or using the morph ball. maybe platforming is equal in its use to shooting in MP, but that's not quite the same kind of interaction (and is yet another case of different environmental interaction than Zelda). And it is a big difference from Zelda because the game borrows most of its control ideas from FPS games and then adds its own twist to it.
I understand a lot of the similarities in a superficial sense (in Zelda you get heart containers and new swords and use bombs to open up hidden passages, in Metroid you get energy tanks and new beams and use bombs and missiles to open up hidden passages) but the way those games play really has nothing in common with each other. Or I guess I could say the 2d versions don't. The 3d versions might share a few similarities, but that's more a case of the Metroid franchise being horribly mishandled in 3d. Seriously, they probably could have/would have done a better job of this
Plus, lock-on targeting and item/powerup based progression does not an action/adventure game make. Those are both elements of the last-gen Prince of Persia trilogy and this gen's new PoP game, and yet those are pretty clearly platformers. Shit, if we're going to really split hairs on this, then lock-on combat and item/powerup based progression also applies to DMC and that is by no means at all like Zelda or Metroid Prime. Like I said, it's just way too general and used in way too many games now to claim the game is like Zelda when it doesn't play like Zelda. A lot of games have similar Zelda-like elements but don't play anything like Zelda.