I'm surprised that there's some people here that don't realize how much work it takes do something like this.
Try animating just three seconds of hand drawn animation (45 to 90 drawings depending on frame rate) and you will soon appreciate the massive amount of skill required to do this.
You can't compare this to CGI animation...that requires skill too, but cel animation is at a completely different level.
Sure, the humour is subjective - to each his own - but you have to recognize that technically this is quite an accomplishment.