...I have no idea whether you're interested in Stargate:Universe at all, but I recently got into it, and there's an author, CleanWhiteRoom on fanfiction.net, who is doing some freaking amazing things in the fandom (with some crossover to SG-1 and SG-A, which I know very little about). (Warning that she has some comma issues and thinks that 'alright' is a word, which drives me UP THE WALL, but you can see how much I enjoy the fic when I say that I recommend it anyway -- usually these kinds of things make me back away from the story IMMEDIATELY, and yet I kept reading CWR.)
Anyway. Back to worldbuilding. I'm going to have to amend my previous comment -- I'm not sure that a world has to have completely coherent worldbuilding (I'm not entirely sure that HP canon or SG canon has extraordinarily coherent worldbuilding) but it has to be vibrant worldbuilding that makes at least a minimum amount of extrapolation sense, I think (which both canons have). Cashore's novels have the problem that they're mostly kind of... bland, with respect to the worldbuilding, in addition to being incoherent in the ways I've already described.
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Anyway. Back to worldbuilding. I'm going to have to amend my previous comment -- I'm not sure that a world has to have completely coherent worldbuilding (I'm not entirely sure that HP canon or SG canon has extraordinarily coherent worldbuilding) but it has to be vibrant worldbuilding that makes at least a minimum amount of extrapolation sense, I think (which both canons have). Cashore's novels have the problem that they're mostly kind of... bland, with respect to the worldbuilding, in addition to being incoherent in the ways I've already described.