Ehhh
The whole thing was amazing... except for the ending. It looks like you rushed it. Why is it that Luigi gets the stuffing knocked out of him the entire series and then gets chopped up and finally dies but it only takes one tiny stab to kill the evil Mario even though he has all of the power stars and is supposed to be all powerful? It just seems like when you first thought this up, you had an amazing idea for the begining and middle, but couldn't think up an ending.
In short: It was all incredible, but the ending was a bit dissapointing.