Not really all that great
To put it quite frankly, you should've left the idea for the one who originally did Mario's Castle calamity. The style of this video is based off that. As Kosimo quite blatantly summarized his review, yes, Jeremy Simms (bigfoot3290) made Mario's Castle Calamity, and I feel if had chosen to make Luigi's Castle Calamity that there would be a very noticeable difference in quality in regards to the comedy aspects of the flash.
Summary: Not funny at all. 3/10 or 1/5. The fine animation earned something.