hot controversy these days is whether a building from Reston's early days is worth saving. The arguments for saving it are basically the fame of the architect, a prominent "Brutalist" one.
Given my education, I might be expected to be on the preservationist side. But no. (I'm stealing the image form a Reston Patch post, linked to above.) I see no point in preserving all of mankind's mistakes. I like some modern architecture, but I don't think this building qualifies as good. The only valid argument for its preservation I can think of is as an example of how misguided we humans can be, how prone to fads and following the crowd.