Didn't like Mario... but 10/10 no doubt!
Bowser is a giant lizard turtle thing, so you made him a kick ass giant lizard turtle thing. Luigi is a tall skinny goofy dude, so you made him a kick ass tall skinny goofy dude. Toad looked like a slightly cooler version of him self. All three of these characters were similar to their videogame counter parts where it counted and then remixed to look awesome.
Then theres mario... a buff guy with goatee a tan and a monkey wrench. He in no way resembles mario, so he felt really outta place, unlike the other characters. He just didn't work for me.
Regardless of this little pet peeve I had, this is an amazing amazing amazing flash. An instant newgrounds classic. I cannot fathom how this was your first flash film, it's on par with flash experts. You should be very VERY proud and furthermore you should keep it up! I cannot wait to see what else you churn out.
hehe, I won't lie, I would love to see what you could do with the wario brothers.