In my not-so-humble option vI don't think that a five part chapter of cheap angst! is worth polluting (until next recon, anyways) over 60 years of history. Cap's the one Marvel hero with a really iconic origin, leave it alone!
You say "cheap angst," I say "interesting developments." And, when you think about it, Captain America's origin has some potentially troubling undertones. A scientist takes a very Aryan weakling and turns him into a eugenicist's wet dream. I mean, there is nothing wrong with playing the origin straight, but if Brubaker wants to add more depth and ambiguity to it, more power to him.