Ignore all of these dimwits.
While the joke of it may be a little aged, you still played it off well. Personally I found it very funny, especially because you used Ash's original voice (Or at least it sounded like that). Plus the animation wasn't really that bad.
Please stop being so hard on yourself. Your video made it on the FRONT PAGE! Do you know how hard that is to do? And if a practice video of yours can make it on the front page, imagine what you could do with the real thing!
People on the internet can be asses. There are many of them out there. They will post negative reviews on your video, some will not have any form of critique on them whatsoever. This will always happen, I've seen it always throughout my many years of newgrounds. These are these people's opinions. Nothing more. While opinions are important, and everyone has a right to it, you don't have to justify yourself to everyone who gives you a negative review.