Yeah, the Silmarillion is Tolkein's attempt to create a history and mythology for Middle Earth the way Robert E. Howard did for the Hyborian Age in his Conan books.
Howard was better, though.
Well, I think Tolkien started to care about Aragorn more as his story progressed, sum1, but I still think he didn't develop the Aragorn/Arwen story very well, which is why he later wrote those appendices for them for LOTR.