I don't know... To me, that article just says that there are a lot of e-mails going back and forth between climate scientists. Which makes sense. The hacked e-mails are between co-workers after all. It says they disagreed with each other, but that the disagreements were small enough that they could agree on a common message.
It says that one scientist was asked to beef up his conclusions to aid in making a bigger public splash. There's nothing wrong with that. A paper is like an essay. You make different points with different amounts of stress depending on what message you're trying to convey and what you can back up by reference or evidence.
What the article does NOT say is that there is any proof of people tampering with results. The article also doesn't say that anyone over-stated or exaggerated anything. Though, it sounds like Santax might have read another article that does have stronger proof? (Can you post that? I haven't read it)
I believe the climate change scientists know what they are doing. Group-think does exist, and entire groups of scientists have been shown to be wrong. But this is the exception, not the rule. I want to present another anecdote.
The surgeon general first announced that smoking had negative effects on health in 1964. It's the surgeon general's job to announce some semblance of a consensus of the opinions of all the medical researchers in the United States. How long did it take before the majority of people believed in this message? How many decades were there doctors actively trying to 'disprove' the link between smoking and lung cancer? And, we're talking about something that's easy to prove. The effects of one object on an individual organism. There's almost no wiggle-room to throw in a wrench of doubt into that picture.
It doesn't take very many people to throw mud at a consensus of ten thousand scientists.