[This game is a lot of fun, you can easily play this game for 100+ hours, NA: Iron Triangle is better though... hopefully they'll add that to the store as well.]
I agree, even though I usually don't like the overworld Koei games as much, Iron Triangle is better. Not by much though. This is a great strategy game.
If this sells well, I would kill for Romance of the Three Kingdoms 8 and 10 on PSN. Hell, maybe we'd get ROTK 12 or Nobunaga's Ambition: Tendou localized and put up to download as well. Take my money Koei!!
By the by, fans of the games named above might want to check out Dynasty Warriors 7: Empires, coming out in February. It's basically a updated ROTK 8 mixed with Dynasty Warriors, with traps, plots, and orders all executable in real time during the battles. You can be a king, strategist, general, or even a mercenary. Characters can die in battle even!