WHY DQ isn't popular in America

Hello!Nice to meet you.
I'm a Japanese.
Well...I have a question.
Why the Dragonquest (In America it called DragonWarrior) isn't popular in America?
DragonQuest is most popular RPG in Japan (than finalfantasy).
It's wonder for me.
WHY?
Could you tell me your thinking(opinion?)about it?

Sorry,Poor English.

I'd like to ask a question to the Japanese posters:

Were games like Fallout, Baldur's Gate and Planescape: Torment ever released in Japan? I'm thinking no, considering the state of the PC market... While many people here in Europe enjoy both Japanese and Western CRPG's, the general concensus is that the Japanese ones are simpler and not as engaging and lacks many of the features which Western CRPG's have. Is there a sort of cult following for these games in Japan which there has been for certain Japanese titles earlier in the US and Europe?

If not, you should really try to "get" these games if you're able... Not only are they excellent games, playing games is actually a very good way of learning a foreign language. I started learning English when I was 8-9 and I started playing Fallout and other dialogue-intensive games when I was 9-10 and thanks to those it was rather easy to learn how to speak and write in English.