I gotta say this is the worst Mario sidescroller I have ever played--which doesn't sound bad since I've enjoyed all of them (I have stayed the hell away from New Super Mario Bros DS), but let me tell you why this is bad.
New Super Mario Bros Wii is terrible single player, and multi-player can't really be much better. The new suit, the propellor suit, is our shitty version of the tanuki suit and cape. All you can do is go straight up and then you travel slow as f--- in horizontal directions, so pretty much you only use it to ascend and want to get on the ground immediately; I feel much anguish slowly moving. The levels so far have not taken advantage of this suit because that would require levels consisting of the screen slowly rising or falling. Perhaps, levels where the screen is moving horizontally against the player's control would take advantage of this power-up (slow moving screen for a slow moving power up). And that leaves me to discuss the levels. There are no levels in the first world that auto-scroll; the lack of variety in the first world leads to the lack of suit difference appreciation. The levels in the first world are designed to barely take advantage of the propellor suit. Once you go straight up to collect the big coin there is no reason to keep using the suit's power. The propellor suit so far is not fun/taking advantage of the level in a pleasurable way. And by having a suit that allows users to gain high vertical distance by the flick of a controller, Nintendo has added a suit that makes platforming deaths less likely to occur. To counteract that fact, Nintendo would have to deliver harder levels (levels that make it harder to ascend or levels that attack the player so they lose their extremely advantageous suit). The game is designed for 4 player co-op. However the camera does not need to pan out so much like it does for single player. The levels so far are boring. The only joy of the game is having your friend kill you or attempt to kill you and you killing them first. Ice mario is pretty cool and there are a lot of cool things nintendo could do with that suit.
I mean I am still on the first world (beat the first castle koopa kid). I couldn't bother to keep playing it (for that one-session, not ever again), but one thing I REALLY REALLY hate is the collect 3 coin shit. This was fine for Super Mario World 2: Yoshi's Island b/c that one relied heavily on well-designed platforming and had interesting puzzle and exploration. This game does not. (Killing yourself is almost impossible thanks to the wall jump. Don't forget the bubble system). The real problem I have with the 3 coin thing is that I like to run through levels. I play Mario like I play Sonic and when you add the coins I have to actively search through the big boringass level for it. Even the stages look tacky. Bowser castle has some walls that come in and out and it looks like some brown clay poor man 3d abomination. There was some Toad rescue mission. That was cool. And Yoshi has the flutter jump, but the game has too much shit in it. Like you can go back to the castle and it gives you hints. Hint movies? That doesn't sound like anything from the mario universe. This game is designed for the new generation of kids.
I do approve of the new air spin move that gives Mario a little more distance on his jumps. The butt stomp I am still debating over. The Wii tilting tech should have stayed the hell away from this game. It feels thrown in. Wonder how this game works with the classic controller..?
I already beat the game at a friends (read: beat the final level). The final boss is f---ing awesome, but it's too damn easy.
If only Nintendo had made that boss Contra3 final boss hard I'd forgive Nintendo for the shittiness it took to get to that boss. The final boss actually takes advantage of the panned out camera and makes the player actually feel like he will die.
What you can say is rehashed is the music. Too much "oohh you're playing a mario game let's throw in old tunes immediately" going on. Granted I listened to the soundtrack way ahead of playing it and I gotta say it sucks.
Another minor bit is that Nintendo absolutely should not have shown that Penguin Mario was available as a suit in the item menu box before you get the suit. I like the surprise of discovering new suits--this is a huge problem when it comes to having the will to ignore the press revealing every little detail about a game. And maybe I have ADD (I don't), but having to wait on the ill-chosen Mario Party themed next level blue circle to appear so I can begin the next stage takes way too long (like 4-5 seconds)--the other games had cool animations of the road forming or Mario walking into pipe at least. Lastly, the only time you should have been able to go bubble form is when you are returning from your death. So yea, if your friends will force themselves to play the game that way it's cool, but it should have never been there at all. The platforming motto is: you f--- up that jump, you die.
edit: to be added later: thought that 4 player co-op slows down the level screen moving progress and that the propellor suit compliments that. Talk about co-op from Goemon Ganbare/Legend of the Mystical Ninja to use as a comparison.