I played it some, and it is my opinion that they did a FANTASTIC job bringing it to 3d. I had doubts because the old ones were 2d, but this is great. It still feels like Metroid, the awesome ball, powerups, blaster, exploration. I don't forget it is Metroid for a second. It got 5/5 on Extended Play, and their only bad comment was the control scheme feeling a little awkward at first. I thought it made sense.
I would pay 100 bucks for a gamecube/metroid combo, no more though. XBOX would do it for me :\