There's a subtle implication here that the likes of Julian Assange are "real journalists" and are somehow noble, which is laughable. Assange (and WikiLeaks) have just as much political alignments and motives that all other media organizations have. Just because he's stuck in an embassy and doesn't have hordes of cash behind him doesn't mean he isn't just as biased.
Quite frankly, WikiLeaks as a whole is no more trustworthy than CNN or Fox, and may be even less so. One of the most powerful (and hard to detect) ways to be biased in reporting isn't by printing attack articles against your enemy, but rather by not printing attack articles against your "friends". WikiLeaks does this every time they choose not to publish evidence damning people they support, which I'd be willing to bet happens more often than we all know.
While we're on the topic, WikiLeaks also commits some pretty atrociously biased editorializing whenever they post new material. They used to just be a site that posted raw information ("here are the emails that were leaked"), but now they also add their own silly commentary to it ("here are the emails and this is what you should think about them"), often with hilariously bad analysis.