This makes me feel pretty nostalgic. The humourous side was well portrayed, felt like an actual episode (which I guess was the point xD). The animation wasn't perfect but I liked it. I did notice one or two weird pauses in the flow of dialogue, especially when the camera changed, but I'm naturally nitpicky so I'm probably the only one who cares. xD Voice acting's really good, only iffy bit was when Katara fell over, but otherwise everyone sounded like their character and didn't have any weird-sounding lines.
All in all, a good nostalgic animation. Now to go glare at Netflix until they put Avatar back. Or at least Korra so I can see what the fuss is all about. xD