Supposedly, there was one in production, but it's in development hell right now.

Here's what they need to do to make a Metroid movie work. Give it more of a horror-feel than the action-adventure-feel of the games (After all, Metroid was based off of Alien.) Here's a plot summary idea- a group of Galactic Federation troops are sent to Zebes to investigate space pirate activity. These are the secondary characters; eventually, each of them get killed off, either in a heroic, dramatic way, or in a horrific, macabre way. Samus is sent to investigate, as well. She discovers the metroids.

Meanwhile, Ridley is sent by the Space Pirate Command to stop Samus. Samus is eventually captured, and is thrown in a prison. She has flashbacks about her past n' stuff involving her Chozo-populated home being destroyed by a group of pirates led by Ridley, and she wants revenge. She's going to be fed to Kraid; she shoots him to death and escapes. She fights Ridley with an ancient artifact she found on a Chozo statue, and destroys one of his wings. He escapes, barely living.

Samus finds Mother Brain, and she blows it up in a climactic battle. Ridley shows up when she thinks it's all over, and grabs her, ready to bite her head off. Samus, at just the right time, is able to shoot him in the face, and escape the space pirate compound, which is blowing up because of a bomb detonated by one of the dying Galactic Federation troops. Ridley is trapped inside.

Samus looks at the ruined compound, in a solemn way, remembering when she was young. The end- credits roll Star Wars style, with the classic theme playing in the background.

And then, we have sequels. Metroid Prime would follow that one, and continue on to Prime 2 and Corruption, as that would probably be the best path for the movies to follow.

Of course, we get mediocre movies like Advent Children when a videogame company itself is deeply involved in a movie. Here's what needs to be done- they need to get a good director, good writers, and a good cast.