My cousin had the original when I was very young and that was my introduction to the series. He basically mastered the game and knew all the cool passwords, so he made the game look very easy. This was back when the original was the only one that existed.

I never played any of them until Super Metroid, and since then I have loved the series. I also LOVED the Metroid Prime Trilogy. Even got that somewhat rare Wii game with all three of them. The only one I really didn't like was Other M, though I didn't hate it as much as some people. Metroid Fusion was alright too, but I wish it was more about exploring like the other ones and the Prime games.

Anyway, overall? Love this series. Excellent gaming experiences, music, and fun!