Ok, dunno why someone keeps saying ugly graphics. they must have been playing metroid on virtual console, this one is so detailed and crisp. runs smoothly at 60fps, no slowdown that i have noticed. In general it has the nicest controls for a game like that, you can shoot accurately and the weapons get better as you go along. It has some really smart puzzle elements in but really feels like they put in less puzzles to appeal to more wider audience, like those people who cant choose which FPS to play on 360 because there are 3793842 different ones, this one allows you to play a futuristic alien shooter, with realistic aiming and shooting, little touches like actually turning a lever to open a chamber and pushing the lever back or towards you, just little realistic touches like that outclass any competition.
If you play deep into the game, you will see just how beautiful it is.
A few points to answer people who are still unclear:
If you have a USA wii, you can play this straight away, whether you have 3.0U or 2.2U because it will update your wii safely and will not put anything extra in there since it is designed for your region.
To safely play it on PAL, make sure you already did an online update to 3.0E on your wii, reboot, then use the method described here to trick the wii into thinking its updating then play the brick-blocked copy of the game (you have to brick-block it yourself, not hard at all).
If you cant be bothered with any of that, making sure you have 3.0E in the first place, play the game untouched or patched to PAL at least and run the update and get 2 extra channels, which hurt no-one and you can enjoy the game over a month early.