I thought it was pretty good. But I thought the world building wasn't too great. It wasn't up to the level of Harry Potter, for example. And HP's not even the gold standard of world building.
I couldn't really get a feel for how the Capital district and the other districts were arranged and how large they were, but it certainly seemed like District 12 couldn't have been more than a handful of towns (and might've been only one town) based on the selection ceremony. But the scale of the Capital and implied scale of the country and war between them, etc. suggests that it should be at least the size of Western North Carolina or something.
The single occupation nature of the districts also doesn't make much sense, although I suppose the Soviets did do some things like that (whole cities being based around manufacturing one thing).