Not bad...

If this truly was just a doodle so to speak then yeah I guess this was good. However, with the lack of color and sound the animation seems dull and it didn't make me feel intrigued through out the whole animation. Also, the sketchy animation style wasn't a bad attempt but, even if it was intentional or just lazyness try to clean up your drawings a bit. They definitely had potential but, it didn't appear as appealing than a "clean" animation. Overall the animation was good. It could use some work but, very cool nonetheless.

Could use some work

But overall, I'd say it was a pretty good job, and you certainly did well in capturing Luffy's sillyness in serious situations XD

So overall pretty good job, just needs to be about 20% cooler :3

Nice Job

Not sure if you're just starting out animating or if you just did this for fun but I like it. Your posing is nicely done through out parts of the animation, If anything, this is a perfect example of an animatic before you're ready to animate the final product. I say you use this and make a final piece. Keep up the good work.

Who is Ruffy?

Who is he, exactly.

not bad...

it's not horrible but I do have complaints. first of all, color and sound would give this a little more spirit (currently, it has no soul)
aside from that, the art could be improved. it looks like these were quick sketches and I think you could do better.
finally, the fight is highly unrealistic. Ruffy would be destroyed by Goku... if you have a hard time grasping this, just remember that Goku could destroy a planet with a mere fraction of his power (Ruffy sucks)
furthermore, you should know that there's actually a video game that does cross their realities. it's called Battle Stadium D.O.N (also features Naruto characters)
another game with both characters is the Jump Super Stars/Ultimate Stars series (for the DS)