Aliens Colonial Marianes is the exception, not the trend.

There are numerous open world Japanese games, multiple platforms ie Nintendo, multiple different kinds of RPGs, your typical JRPG, a game like Dark Souls, a game like Dragon's Dogma, action RPGs like Tales of Xillia, numerous hack and slahers like Dynasty Warriors, numerous TRPGs like Disgeaea, TPS's like the Resident Evil games, Fighting games like Street Fighter, and numerous adventure games like Okami.  Games from developers like Platnum games are some of the most unigue games we have.  Japanese games have plenty of variety.

The maturity of most video games in general caps out around there. Would you like me to name some immature Western games? It would be easy.

The people saying that probably only play Call of Duty and never heard of JRPGs

I don't eat noodles while watching anime nor do i pretend to be Japanese, so it doesn't bother me.

The problem with most Western developers is that most focus on Graphics> Gameplay.

It's an extreme example where even actual gameplay didn't represent the game. It is common for a trailer not to tell you much about game quality. The people doing the advertising aren't the people making the game.

That's not always true. 

Most of the games listed in Pokoko's post, even though I severely dislike most of them, are heavily gameplay centric.

Dead Island is another exception?

Do you honestly think you can name enough bad games with good trailers to make them not the exception...I could literally name 100s of good games that had good trailers.