Finishing MP1 and Fusion again since I was 10 or 11 is a great feeling of nostalgia.
The only problem is, I'm playing the Metroid Prime Trilogy and the Wii Controls get a bit fussy at times, but overall these were as enjoyable as I remembered them to be.
Now I'm on MP2 and Zero Mission and soon a Metroid game I never had the oppurtunity to play until recently, MP3.
So yeah, Metroid general topic, go nuts.