They're NOT patent trolls at all. $200 million isn't much, and CSIRO can make good use of it.
But there is a problem when major industry standards like 802.11 a,g and n can somehow end up patented, after years of work and negotiation by many different companies and individuals, who now have to pay to use their own collective, public work. Whether the problem in this case is carelessness by the companies, or corruption of the U.S. patent system, or both, I don't know.
In any case we do have a problem, and it could bite much worse in the future.