The game totally sucks. It is way too difficult in an absurd sense. I mean the puzzles are really mindless sometimes. Example: There will be a small piece of rock lying in some corner that you need to blast to find your way out.
Now how on earth can you figure that out apart from hit and trial and missing it out several times.
I gave up the game then found out this link: http://www.nextgenwalkthroughs.com/systems/wii/metroid3/index.php
which has a complete walk through of the game, so continued playing but then gave up again as it was not as much fun.
I have played RE4 for several hours and it was just awesome, the puzzles lent special life to the game. These puzzles are just mindless.

My review in a nutshell: I love this game, and I recommend it to anyone that enjoys a good, deep action-adventure game, or those who are ready to take the jump into more serious Wii games.

In a slightly larger shell:

MP3 is the first foray for Samus Aran into the world of Wii controls, and I have to say, it is a very successful one. The new controls are more than just a button reassignment, something that the latest Legend of Zelda had a hard time escaping. Unlike that title, though, MP3 was designed from the ground up as a Wii game. There are rumors that Nintendo added the Nunchuck peripheral to the Wii just because the developers of this game asked for it. I believe it. Motion-sensitive and IR tracking tasks are sprinkled throughout the game, and rather than feeling tacked on, the controls feel unique and pull you in. Instead of pressing A to remove that power cell, you pull the sucker out and twist it free. The first time you see your movements doing that, or pulling a shield off of a bad guy, you know you're experiencing something special. IR tracking for the main look movement (moving your helmet) is incredibly accurate and welcome, too. Red Steel is an example of how this can go bad. MP3 is an example of how it can go incredibly good. Do yourself a favor and set the look sensitivity to Advanced, though. It makes all the difference.

On to the story. MP3 is the first Samus game I've felt the need to finish. I played MP1 until about half-way, and got lost among the dozens of arm cannon powers and specially locked rooms. I'm sure if I tried again, I could get through it, but I didn't feel that need to play on. In this game, that need is strong. I loved the story, even if it isn't quite up to par with recent hits like Mass Effect and Bioshock. The whole game is mapped out more clearly, without sacrificing the puzzles that made the first game good. I'm also a fan of the new upgrade scheme. Instead of having a bunch of different attacks, every new upgrade supersedes the last one. It makes playing the game much less stressful. Also, I just want to add that voice-overs (for everybody but Samus) are very well done, and add so much to the game. This game feels alive, instead of the lonely, sterile feeling I got out of MP1. Overall, it is a much more mature, large attempt at storytelling, and it is Retro Studios best effort yet.

Just a quick word about the graphics: They are awesome! I'm talking XBOX at its best, here. I put it on the level of Halo 2. Bloom lighting, beautiful texture work, and expansive worlds work to make the whole experience feel bigger and better. Sure, there are annoying side effects to this beauty: doors that you shoot open may take 10 or more seconds to open in extreme cases, as the huge rooms behind them load. I think it is totally worth it, though, and I am not willing to go back to MP1 graphics just for quick loading.

All in all, this is easily in the top five Wii games to date. A solid story and presentation, along with beautiful, imaginative graphics and a mindblowing control scheme, make this a no-brainer for fans of the series, and a serious contender for any Wii gamer that bought there system for more than Wii Sports. If you are expecting a first-person shooter, you might be mildly disappointed, as this game is equal parts of action, puzzle, and exploration. I think it's a winning formula, though, and my opinion is that all competent gamers should try it out.