I know it's shot very carefully, and it certainly doesn't appear rushed or cheap, but the actual quality of the film used could be a lot better.
What this guy said. It's not as if the show has a lot of special effects to push it over budget, it's just that it's on a smaller network and has a lesser budget I'm guessing. But it lacks the production values IMO that other shows have. For instance dexter looks better than breaking bad image wise. For mine breaking bad has a dull sheen to it. It's like NCIS, or channel seven's footy coverage. Thankfully for breaking bad, it's a much better than those two so it escapes.
It's a great show, but it doesn't wow you with it's images. It more relies on the beauty of the ares in which they use for shooting than their production values.