Particularly the first one, and also the Trilogy for the Wii with really good motion controls.
Its original, it goes to places no other game has gone before. Its really immersive and atmospheric including it's locations & music. Also it does the Metroidvania genre in the style of a FPS really well and is critically acclaimed for translating the 2D franchise into 3D while keeping it's signature style intact. Its even arguable better than it's 2D counterparts as the exploration element has a new dimension. Also the scanning mechanic also adds even more new dimensions to it's new 3D dimension.
I can't wait for Metroid Prime 4, its gonna be epic XD
I have (or have/had in the household): ZX-81, Commidore 64, Amega, Sega Master System, Super Nintendo, Sega Megadrive, Gameboy, Playstation, Nintendo 64, Windows 95, Gameboy Colour, Windows 98, Sega Dreamcast, Gameboy Advance, PS2, Gamecube, Xbox, Windows XP, Nintendo DS, Xbox 360, Wii, PS3, Windows Vista, iPhone, Windows 7, 3DS, Wii U, PS4, Windows 10 & PSVR. Plus, I will be getting the New Nintendo Switch sometime in 2019 :D
and I Don't have: Magnovox Odyssey, Any Atari's, Any Macintosh computers, Nes, Sega Gamegear, Virtual Boy, Sega Saturn, N-gage, Xbox One, PSP, PSVita & Andoid Phone. Plus any non-main-stream consoles/platforms I haven't mentioned.