I understand exactly what you are saying. Right now it's like the PC's just woke up and suddenly they had powers. Where did they learn them from?
If PC's are supposed to be the only PC's around then how do they learn their powers? This is something that has always bothered me with the current incarnation. I know some people can fit this into a story but from my understanding the PC's are supposed to be unique from day one. Well I want to know why they are so unique and where did they learn their craft.
What makes John Maclain different than any other cop?
What makes Gimli different than any other dwarf?
What makes Harry Potter different than any other Hogwarts student?
What makes Conan different than any other warrior?
What makes Tassleholf Burrfoot different than any other kender?
What makes Bruce Wayne different than any other rich kid?
What made Robin Hood different than any other woodsman?
These are all heroes whose skill set isn't that special - when compared to the normal for their worlds.
They are special because when time came for heroes to arrive they were the ones standing up to do so, rather than the masses waiting for someone to stand up. And this choice changed them and taught them things that normal people just don't get. They may not have "powers" that others don't but they use them in a way that is unique - they use them to "save the f-ing day" rather than to just get through the day, which is what most people do.
Most wizards would use magic to cook, clean, help at work - heroic wizards use it to stop tyrants. Normal woodsman use bows to hunt for their dinner, heroic ones use them to fight off the army of orcs that pours from the mountains at night.
D&D 4e just assumes you start the game after that first choice to "stand up and be counted" that changed the way you look at, and interact within, the world. 0th Level lets you have the adventure that was that first choice. But once you have made that choice you have become a HERO.
How many characters in stories start as a commoner/farmboy etc? Now, how many of them are still commoners/farmboys by the end of the first book/film/story they are in? It is a common trope that once you have stepped into the mantle of a hero the die is cast - you are a hero.
And this is how I see 4e working. The skills are not so rare that others have no concept of them, or that others couldn't learn them for themselves (tho some power sources can be a "born with the knack" type), but those willing to turn those skills to the work of adventuring/being heroes are still a rare and valuable breed.