To everyone complaining about how this first season ended, keep in mind that season one of Silo covers just about the first half of the first book in the series, Wool. It stopped at a reasonable point, IMO. There was a major section break in the book at just about the same point.
I have a few quibbles with the adaptation, but overall I think that this is good television. Any comparison with Lost and other "mystery box" shows that don't know where they're headed is way off-base. Despite the changes they are sticking reasonably close to the book, so I have no worry that they are going to go off on a giant tangent. There is a known end point.