Muramasa was a game that could be described as a pretty Wii action game with a sort of wannabe Metroidvania style gameplay.
Environments are segmented into different rooms and corridors but they're all fairly similar and almost never vertical making the game feel less like exploration and more like a really long, drawn out, side scrolling brawler.
You basically run around collecting swords to get past barriers so that you can get more swords so that you can kill enemies for loot needed to make more swords which you then use to beat bosses for, guess what, more swords used to get past the next barrier.
That said, the controls are nice for what they are; in that you can either mash A to use single stroke attacks or you hold A and swipe the Wiimote to use dash attacks that are weaker but keep you mobile and prevents mobs from mobbing you. Swords break which means that you can only use a sword for a certain length of time but you get to bring a trio of swords with you for switching purposes while your broken swords slowly repair themselves (think cooldown/overheat).
I've only played as Princess Peach but her plot can basically be summed up as 'dead swordsman somehow comes into possession of a chick's body' then you start after the fact and proceed to kick butt while finding out what happened and stuff.
I need to get back to this but my Wii backlog is getting unfortunately large and Xenoblade Chronicles comes out in a week and a half, and by the time I'm done with this
Gears of Final Story Creed Teh Last Fantasy will probably be out, and that's not including the games I would like to tackle now (Sin & Punishment 2, ect...).