Guys, you're forgeting how diffrent cartoon are produced in Japan. OAV's usuall have higher budgets than long lasting Animes. This allows for bright and shinny animation, better voice actors, and more things to do.
Shows like Inuyasha, DBZ, Yu-Gi-Oh! and other long lasting shows have a frighteningly low budget. They usually reuse animation frams time and time agian, or the purposely keep charcters still during dialouge and use a special kind of filter to animate the mouths.
Than agian, companies that do that are sells outs.