I'm right in the middle of this one. I think ALL forms of cartooning is a part of it's creator. When you watch any cartoon, you can just see a personality. In such a way it seems that all cartoons (no matter what the nationality) are practically the same. Sure the animation is different, but cartoons shouldn't be solely based on artwork. I do agree that anime has been made for an immense amount of genres while American cartoons are usually just for kids or they are heavily political if otherwise. I know that Japanese cartoons are political too, but at least there's something for everyone.
The storylines are of different styles. American cartoons (kid based) are more goofy and characterized. Japanese children cartoons have more of a human base (realistic style). Personally, I love to study both sides because it's fun to see why they (the animators) chose such styles.
American cartoons are more creative in art style with the type of charicatures. I mean even Osamu Tezuka started getting his ideas of art strategy from Walt Disney's own style. You can see it in Astro Boy and Metropolis mostly. Alot of manga artists then followed Tezuka in that style (back before the 80's) thus creating a culture bridge through style of animation. Then America aired it's first Japanese cartoon in the mid 60's, creating yet another culture bridge. I understand that the story was severly edited and the voice acting was different, but think of the American culture back then.
I grew up with both too. So that's one of the main factors why I'm pretty much impartial to either side.
Okay, the final paragraph: People shouldn't just shun a country for it's style of cartooning. That prevents cultural bridges from forming and ultimately, disrespect for one's own country in whole. I see it when I go to anime conventions V.v Same with American Comics Vs Japanese comics. They are both great and bad in their own way. Everything is built up with components.
I think that's about it for me.