Meh. It wasn't bad. It definitely wasn't a Metroid game, though. The people who made it focused way too much on the combat side of the thing, and less on the classic adventure-puzzling feel of Metroid Prime, Super Metroid, and the others.
Also, I think they screwed up completely when they gave Samus a voice. Her voice actor was great, but it was unloyal to the series. It was like letting Link talk.
I think they succeeded in the control scheme/first-person ability, though. Those two made the game very fun and playable.
Basically, if it weren't a Metroid game, it would be soo much better.