This might actually be the best one...
The best part about this one is that the action is much more exciting than all the others. Don't get me wrong, Power Star 4 was wonderful but it seemed a little one sided. Music fits in well, very epic, the fact that Mario and Luigi changed location so many times just made it even better. Slow-Motion was a pretty good addition, lava was neat. My only problem, I just noticed recently, is that with all of the videos, Mario's eyes never stay red. In every fight scene, Mario's eyes go back to being black again. It's kinda weird.
There is only one thing that I want to say. I would have put it on my review to Power Star 4 but I didn't think about it. Why are the Boos doing this? I know it says that they want to destroy all creation, but why? And wouldn't that mean that they would have to destroy themselves?
10/10
btw, If you are wondering why I replied to 4 then 1 then 2 then 3, It's because I didn't think about rating the 1-3 until recently.