I played all of the Metroids (except the SNES one). Metroid Prime was a spectacular game, and as a result, I began to play the older Metroid games. In early 2004, the "Zero Mission" game was released and it was alright. You must defeat Kraid, Ridley, and other monsters and get new items, just like in the original. However, you get some elements introduced in games after, such as speed boost and all that stuff. It is like "Metal Gear Solid: The Twin Snakes", which was a rehash of the original with mechanics featured in "Sons of Liberty" and "Substance". The most disappointing thing was that it was too short. I completed it in a week, whereas in "Prime", I completed it in the course of a few months. Even "Fusion" was a bit longer, even without those cut scenes. The only thing really new is that level with the suit less Samus and her pistol. Once you beat the game, you get the original Metroid, password system and all, but you start at the beginning even if you type the right password.
Score: 8/10