The Good: Evolved Metroid game play, great story, good level design
The Bad: Short, graphics don't push the GBA, doesn't do anything new to the genre
While this is only the second Metroid I've ever played I keep getting more and more addicted to the series. While every Metroid adds something new to the whole series Fusion is no exception. Samus is stuck in a space station and she gets fused to an alien organism known as X. While a mysterious computer guides her through her missions she has to stop the source of the X. She discovers that the X has cloned Samus known as SA-X. While you get all your abilities to be able to fight against SA-X you find out who the mysterious computer is and what the X is. While you have all your typical Metroid game play mechanics there is some different stuff such as new weapons, and what not. The level design is superb here but there are some flaws to this game.
Sometimes it'll be almost impossible to find out where to go sometimes which makes things frustrating. Some boss fights are extremely hard and set you back to save points very far away. The game is really short clocking in at 4 hours or so but during your first run through it will take about 6 or so because you'll die a lot and you'll have to find out where to go. The story is good but takes forever to really unfold. Fusion should be played by any side scroller fan and I promise you'll love it.