Ah geez, I love these "yo, yo, yo, Old Skool" players. Did you honestly expect gaming to remain in the 2D realm forever? As gaming shifts towards immersive 3D, so too will its popular genres because, frankly, it's what the majority of the people playing games out there expect. Sure, everyone likes abit of nostalgia now and then, but you know what, Nintendo put out Metroid Prime and Metroid Zero Mission, and I'd say that's a bigger trip down memory lane then alot of franchises are providing. Hell, Nintendo has given fans alot of SNES-era fan service via the Gamecube and GBA.
Metroid Prime and (lord how I'm hoping) Prime 2 both take on the key aspect of the series which is, by the way, exploration and not what 'dimension' it's in. Oh, and calling Metroid Prime a first person shooter with the Metroid name attached is like saying Super Metroid was a Mario Bros. clone. If that analogy sounds stupid, well, dwell on it abit. Look, I loved Super Metroid probably as much as you did, and I can understand you wanting to relive that experience time and time again in a new Metroid game, but maybe your disappointment stems not so much from the fact that games are getting more modern, but rather that you, and gaming, are just growing up. It happens. I'd say games like Metroid Prime show that there IS hope...