The video was clearly made with a strong bias against Naruto. It's the same two parts over and over + some added worthlessness. The animation copying has been known for a long time already as well.
Many Cowboy Bebop fighting animations are in fact copies as well. Mostly of Bruce Lee since Spike fights with Bruce Lee's moves.
I once even heard that some of the people who worked on Cowboy Bebop work on Naruto as well. Which would explain the copying even more. However, I do not know if this is true.
Drawing good fight scenes must be pretty hard. Certainly if you only have very limited time. They have a new episode every week or so, that surely brings down the animation quality.