I really love this game's OST, and is one of the best in the series, IMO. The main battle themes are pretty regular, but most "event" ones are made of awesome, such as the boss themes (most already in the game). Coerthas and Mor Dhona's area and battle theems are also great. Many of the cutscene songs are well done, as well as the villain themes (just the song that plays when Garleans are on screen already shows whatever is gonna happen, it's not gonna be good.)

Mistbeard Cove's theme is also one the best dungeon themes I've seen...it has a Yasunori Mitsuda feel that's plain awesome.

Also, about the "rockness" and stuff, the world is not that devoid of technology. It really doesn't blend well for some areas (The Black Shroud themes being the biggest ofender, that place REALLY IS devoid of technology), but in general it works pretty good.

Can't wait for an official full OST release......mostly because I need to know that obvious "final boss theme"'s name.