From what I have seen so far, it sucks.
It seems to me the game gets only some good reviews, because of its famours predecessors. This is also the first time the game was not developed by a nintendo studio, it was developed by team ninja who were previously responsible for the ninja gaiden series. I played the game Ninja Gaiden Sigma and didn't like it ... I don't think this new metroid game transports anything new or excels in something ...