I'm going to have to say Bongo Bill is more on-target than anyone else in this thread, except that I submit that a lot of the crap from Japan DOES make it over here these days.
To complain about rockets and war and such as Western cliches may not be wrong, but to say that Japan avoids them is utterly disingenuous. Zera, you just said you're playing RE4. Japanese-made, but utterly Western in design. It's practically an FPS, featuring rockets, guns, gore, monsters, and violence on a level potentially unmatched on the Gamecube except maybe Killer7 (another violent and gruesome Japanese game). Yes, RE4 is awesome, but it also conforms to many of the criteria you set out as negatives.
I just got back from Japan last week. Consider their top 5 selling games while I was there:
1 - Crisis Core: Final Fantasy VII - Yet another milking of the tired FFVII cow, telling an "untold" part of the story that really didn't need to be told in the first place, otherwise it probably would have been part of FFVII, no? Heavily violent, and featuring the angsty cookie-cutter androgynes mentioned by Bongo Bill.
2 - Another Century's Episode 3 - Yet another "Gundam/Macross/Mazinger/every other giant robot franchise Bandai owns" crossover game, in which angsty cookie-cutter anime characters whine about how much they don't want to fight and then blow the absolute crap out of each other. This series has been going for well on 20 years now, because originality isn't exactly something in demand over there.
3 - Final Fantasy Crystal Chronicles DS - Another Final Fantasy game. Shocking. Trend developing yet?
4 - Bladestorm - Yet another Dynasty Warriors clone, but this time based on Western history. Specifically, the Hundred Year War. No rockets, but certainly violence, the killing of thousands of people per level, and yet another war setting.
5 - Samurai Warriors 2: Xtreme Legends - Yet another expansion to yet another Dynasty Warriors clone, based on Japanese history. Violence, war, killing of thousands, etc.
So yeah, I'm not seeing this Shangri-La of originality and fun fantasy you claim Japan to be. It's steeped in the same level of crap the Western market is, it's just different crap. Hell, this list is an improvement over recent years, when the top sellers tended to be still-picture anime dating novels for the PS2. Both sides of the cultural fence produce winners and losers, and there really is no way of saying "these guys make better games than these guys," because the differences are stylistic at best and imaginary at worst.
Play what you like, but trying to justify your personal tastes with sweeping generalizations about cultural design preferences is pretty silly.