I disagree, well with some things. Stylistically, the Boondocks is basically an anime made for America. Also Inspector Gadget and Thundercats looked more 'anime' depending on the studios that drew certain seasons. More-so than some others.
From Gadgets wiki: "In the second season, the animation increasingly began to resemble a typical 1980s Japanese anime cartoon, most likely because it was animated by DiC's own then-new Japanese-based animation facilities (many first-season episodes that were animated by TMS Entertainment often mimicked typical American animation, akin to their work on Tiny Toon Adventures). It was not uncommon for Gadget to briefly freeze in an "anime" pose when shocked, or slower frame rates when characters would move."
I do agree shows like Avatar and Teen Titans are borderline, or obviously inspired by anime.