Brilliant. THE most polished 3D game I have ever played. Metroid takes the best bits of Zelda and Mario and blends it into an action/exploration FPS that feels fresh.
One of the master strokes to this game is the way the sense of being IN the suit is conveyed, the visor steams up, gets blood on it, static interference and best of all in bright moments you see Samus reflection on the visor blinking and looking away. This really ramps up the immersion and gets rid of the bobbing camera with gun feel that alotta FPS give you.
The game is brilliantly paced keeping your interest constant even though you may be wondering through the same section of tunnel for the 10th time and crucially for a game like this the boss encounters are something special and require a little thought (not too much mind this is an action game).
Even the platform sections (a real worry from a first person point of view) work really well.
Overall QUALITY QUALITY QUALITY
Welldone RETRO STUDIOS!