Computer Science
does have the worst unemployment rates, and it has done for a long time. A quick Google shows articles from
2009,
2010,
2011,
2012,
2013,
2013,
2014,
2015...
There's no obvious reason for this that it can be attributed to, but common thoughts are that some statistics encompass all computing degrees under the Computer Science umbrella (which means all the people studying ICT, Games, etc are lumped together with the Computer Scientists and Software Engineers) which can alter the figures, Computing has also been excellent at getting a wide range of students (it's reportedly popular with minorities, for instance) to study it and some are unfortunately discriminated against.
The curious thing around all this is if you read the headlines regarding Computer Science graduates, you'll find articles saying they have the worst unemployment rate (leading you to think there are more graduates that jobs) whereas other articles say employers are having an IT skills shortage (leading you to think there are more jobs than grads).
In my experience, it's both. Universities, on the whole, aren't teaching you the skills that employers are looking for and not many employers can take the time to take on fresh graduates that are clueless and properly train them up to a good standard, so many will be passed over at interviews.
The IT industry is one that's very competitive, but can also be very good to you if you know what you're doing. It's life long learning, so if you're happy to do some studying outside of lectures to brush up on your programming, learning different operating systems and use different tools/processes/methodologies you'll be fine.
Now, in my experience, the statistics are wrong as out of the dozen or so people I knew on my course, all of us had job offers before we graduated. If you're not clueless, you'll be fine.
There are lies, damned lies and statistics.