Don't get discouraged. I think its very rare to have a graduate school actually say what you can improve on. If you really, really want this MA in Journalism then you should go for it next year. After you have cleared your head, compare your application to the school's requirements. Re-read your statement of interest. Talk to people that have graduated/gotten into the program. I'm sure there is a way to increase your chances. Also, this year try to get more experience in journalism - who knows what people you were competing with this year?
I got rejected from my top (and only) choice too. I feel for you. But we can't give up!