Single player Metroid is more adventure puzzely with shooter tacticy... Whatever the hell genre you consider it.
But whatever seperates it from Halo would probobly be taken away in online and multi-player modes? In Metroid Hunters online do you run around shooting at random like online Halo or do you actualy need to think about things like Metroid single-player?
Now??? Games don't get shit out... Except at Ubisoft.
If there was a "good multiplayer shooter" coming realy soon we would already know about it. I only have hopes for one upcoming multiplayer shooter (besides Metroid if it has multiplayer) but there are still months to go.
Try 360 or last-gen systems.