Japanese food that is overwhelmingly awesome

Unfortunately, Japanese food in the US has been stereotyped as "Oh, you mean a Teriyaki Bowl."  Yet there is so much more, most of which isn't seen unless you go to a Japanese supermarket. 

Okonomiyaki- Sort of a lunch or dinner pancake.  Varieties include beef, shrimp, vegetables, etc.  Sadly, I've never seen a US restaurant serve this.
Sukiyaki- Almost like flat plate fondue.  Cooked beef, vegetables, mushrooms, clear sukiyaki noodles.  You can eat the stuff over rice or dip in raw egg with soy sauce- just make sure you have non-salmonella kind.
Mochi- A chewy rice cake wrapped in seaweed and dipped in soysauce.

Why does Japanese food stay in Japanese stores?  Mainstream Americans get teriyaki chicken as their exposure to Japanese food, or sushi if they're going out, and that's it.  Do they really hate the more exotic dishes, or the chocolates and dessert that try really hard to be european, or just about any traditional food?