No worse than the ones that serve its competitors:
[M]any of Apple’s major competitors use precisely the same suppliers. Foxconn supplies Samsung, Hewlett-Packard and Dell, as well as Apple. Most of the recent attention on unethical practices in the Chinese electronics industry has focused on Apple, rather than its competitors. But Apple may be the main target largely because, given its size and high profit margins, it’s perceived to be in the best position to improve labour standards, not because it’s own standards are the worst.
Matt Steinglass reframes the debate:
I don't know what other people are mentally accusing Apple of, but in my book, the relevant question in this whole drama has always been very simple: is Apple adequately ensuring that its Supplier Code of Conduct is being enforced, and is that code of conduct itself adequate? The question is not whether it is sinful to buy an iPhone. The question is not whether Apple is a force for good or evil in the world. The question is not whether trade with China is good or bad. The question is not whether iPhones should be manufactured in America. The question is simply whether Apple is, knowingly or through negligence, allowing widespread violations of its Supplier Code of Conduct, and hence allowing misery to enter the world that has no reason to be here.
The Dish 