The best Metroid game I've played since SM was Batman:AA. They nailed the formula, the atmosphere, lore elements, ancient mysteries, etc. Ideally a new Metroid would be just like that game, built by a talented and dedicated studio like Rocksteady, but with the gameplay improved to be dual analog shooting in the third person. Original Metroids always had great shooting mechanics for their time.
Also, Samus should look like Kim Bassinger.
Actually, better yet would be to actually pay a modern hottie like Charlotte McKinney to appear in the game. That would draw a lot of buzz, like Upton and GoW.