Ive given it a good blast this evening.
Im upto the very start of the second planet.
Just some notes thus far:
Controls:
Not as good as people make out imo, it still controls like red steel, and so, im left spending most of my time wildly firing into thin air in the more tense situations. Plus, the lock-on is near useless, and a combination of that and the lack of control with general aiming makes charged shots and missles pretty pointless unless your against big targets or slow ones, as they hardly ever hit.
And why are the space pirates so small and thin! Hard to hit at times!

.
Graphics:
Im not sure they are as good as people make out, but its definatelly the best looking Wii game. Not that thats an accolade considering whats on Wii.
Sound:
Good use of voice in the game, and the other sounds are as good too. Good amount of bass in the sounds that should have them.
Story:
Seems to be very story driven upto now, which is good imo. I like a good story in a game, helps keep me interested.
Gameplay:
Thus far, there is a bit of back tracking, but wether its just because the first planet+ship are small/starter areas, but there doesnt seem to be as much 'roaming' to do as there was in the other 2 MP games. Maybe that'll change now im on the second planet though?
Overall, im rating it 6/10 upto now.
Its still Metroid, and the story does have me intreagued (like how an asteroid can have moving tenticles

), but somethings missing.
Maybe that'll change as i get further in? Hopefully.