Don't get me wrong, i loved this game. It just didn't feel like a Metroid game to me.
There was a "stick with a carrot" leading you through the entire game. Not something I was used to.
And the story of learning about Samus wasn't necessary. Without spoiling it, there is something that happens in the ending that made me groan out loud...
but as a game, this was a great expeience. i loved playing it.
Solid graphics, sound (for GBA...) and controls make it a definate purchase.