I'm just about to fight my first big set piece battle- right after you help Ophelia get weapons for the Razor Girls.
Quick impressions so far:
-The world is awesome to look at. While the game is not the most impressive in the graphics department, all of the metal iconography all over the place, the cool weather effects and stuff like flaming meteors falling in the distance make this a winner.
-The combat is kind of simplistic, but the game does a good job so far of giving you different stuff to do to keep things varied. Utilizing your headbangers and other allies in battle helps.
-I'm pretty sure that this is the best voiceover work I've seen in any game... ever. Everyone fits perfectly for their role and the dialog is, as always, top notch. Lars is a bit of a ponce, but everyone else is awesome.
-The Metal Forge is bad ass, and so is Ozzy. Upgrades are cool.
-The Face Melter solo is as awesome as you'd think.
My only real complaints are that I can see the side missions getting repetitive, since the bulk of them seem to be ambushes, and that as far as I can tell you can't turn rumble off. I hate wasting my batteries.