I don't know, I think Metroid would suck for multiplayer, unless it was many different kinds of hunters going at it, if even then.
I think what bothered me about it was that it was more linear than previous Metroids.
I still enjoyed it a lot, I'm looking forward to my next run through, if nothing else the art style is incredible in that game.
3rd Party Wall of Shame
http://www.nintendoworldreport.com/forums/index.php?topic=30478.msg581036#msg581036