Metroid Fusion is awesome. It's a very worthy successor to Super Metroid. Fusion improves upon the previous game's controls, allowing the player to pull off more complicated moves smoothly. Exploring the space station setting's maze-like paths are rewarding and fun.
The art style combines organic and technological sci-fi elements to build upon the Metroid universe. Samus's quick monologues when descending elevators to newly opened sectors give insight into her character and show her determination and will to successfully complete her mission. On top of that, a few familiar beings from games past make an appearance as well.
I'm surprised this game in the series isn't as talked about as Super and Prime. It's a shame that no 2-D Metroid games have come out in over a decade. On a side note, Gameboy Player: Best Nintendo peripheral ever.
Recommendation: Play this game after you play Super Metroid.