I lost multiple times.
You're not alone.
Note: My last post was, in a way, cut short, as I was posting on my Wii and abruptly had to stop for something. Anyway, to continue, I'm with BP as far as his opinion on game names (this one's in particular), but I'd like to add that despite all its issues, glaring and otherwise, I think the four-person multiplayer really is reason enough to get NSMBW. I have no problem with Super Toads and lame suits so long as this game is what it seems to be: The Mario series's answer to Four Swords.
My main beef, actually, is that both it and SMG2 are the last two console/portable Mario games with different level design and Yoshi thrown in.