I do think the idea of 'Greek Mythology' seems like what they were going for. Much as I did not like some of how their cosmology was executed, what I certainly DID appreciate is how far they tried to go with it and generate a really detailed story with their gods. Mountain ranges the results of fights, blighted areas due to some god's poisoned blood and so on. It made it feel much more 'real.'
Yes, there was that kinda clear theme at beginning. Then they started to give writing to freelancers who didn't kinda get it. They started to lost their theme. Major plot in books for f* sake was returning forsaken elves to normal boring elves. Sure some later books were still well written, they had just forsaken original Scarn.
Edge of Infiny had some cool new stuff, but IMO it was worst book ever, because how it refered to older stuff. It got numerous stuff plain wrong, like Lethene's place of imprisoment suddenly was not Abyss. And Enkili was referred as having some insanity aspect (must be some attitude to CN alignment), but it Scarn that aspect was Belsameth's.
Divane planes sounded really boring in that book too. I am speaking of content not writing skill here. It felt like someone had thrown little Scarn names in planar system borrowed mostly from original Manual of Planes (first edition AD&D).
Star things were new, and thus addad something there. That book was big missed opportunitity. Then again, at that point White Wolf was basicly already made decision to end Scarred Lands line.
I think Golarion book about planes is much better. Much more inspiring.
Scarred lands was in beginning very unique fantasy world. At the end, if you keep all sutff published as it you'd get something different. And much less cool. But many books have IMO much good to steal, execpt for Faintless and Forsaken, but that's me.