SM is great stuff, definately play the Primes too. The GBA ones are more B-level fare sounds like you've played them, they're good but just not on the same level. Metroid 2 is about the same, nothing amazing but definately deserves a play. The original is mediocre at best though, it's full of cheap deaths and non-sensical level design. Unless you memorize the paths to certain items you can pretty much expect to waste a ton of time getting lost and stuck and if you have to start over in the later areas it's basically one hit kills, so it's usaully easier to just start a new game. You play it as a part of the Metroid fan checklist or for nostalgia from your childhood, but it doesn't hold up today. Hunters is a multiplayer game, decently fun but portables just can't do the FPS genre justice, single player isn't good and the controls while solid cramp one's hands.