This philosophy is 
useless/bullshit/not a science argument is quite patently... uh... bullshit.
It's a soft-science, for one. In that manner, it can be grouped with the likes of psychology and sociology. 
My degree was essentially composed of courses within the International Studies, Psychology, Sociology, Philosophy, and Political Science topics. Each typically geared toward: 
1) why we are so fucked up; 2) why we generally are a failure of a species; and to bring the picture into a little more focus and in broader terms, 
3) what constitutes our main drives, or what is our most basic unconscious goals, that so commonly pushes us toward conflict at all levels of the totem pole that is civilization; and lastly, 
4) What the hell do we do about all of it?.

Of course, the major and topic didn't say it in so many words; the school called it 
International Studies: Security and Intelligence
For people in leadership, it's actually very good knowledge to use. The soft-sciences, with the right focus in mind (especially for intuitive-type people), can really help one understand what drives people who are seemingly nothing like you. For people who are low on the leadership ladder, like boots on the ground leaders, it might not change foreign policy, but it can definitely aid in local-level conflict-resolution and can in fact be a huge tool for the "win the hearts and minds" goal. 
In essence, the soft-sciences aren't great for problems of the Present, not in the structure of today's world. But in the mind of the right people, especially people who yearn to understand what drives cultural movements, it is great.
A problem though, unless one wants to be a teacher/instructor, Philosophy is hardly something with which one can make a living using only that science. But does that mean it's not a science, or worthless? People who are a cog in the public-policy world, in some shape or form, need to be multi-talented. It's one of many pieces of knowledge that, combined with many other tools, can only help.
Social sciences are a very different world from physical sciences, but physical science isn't the only thing mankind needs to save our asses from the world, because physical science isn't doing anything but making better tools to either take or save lives. We need it, yes, because it's the only path toward revolutionary progress in the natural world, i.e. better tools that make our lives better - but all that research, without anyone trying to understand and hopefully change the way we view the world, only leads to more problems. The physical sciences 
need the soft sciences if we are to ever really understand the brain, understand our mental processes; the physical sciences can only help lead to seeing how everything works, the soft sciences will help put the pieces together so that we can understand how the civilizations function in ways that are almost like a colony organism. The pieces fit together in so many convoluted ways, and the physical sciences will never lead to actually solving any problems on that frontier.
The worst part is the soft sciences have actually come to many similar conclusions over the generations, but nobody has ever actually tried to implement anything that we have learned. It's actually kind of disgusting to see how the global civilization has not changed over the past 2000+ years, and in fact some might say we have only regressed from any progress that had been made. Nobody cares, because as a collective whole, civilization lacks foresight and generally could give a rat's ass about future generations. 
In short, to say philosophy or the other soft sciences are useless is laughable. They are extremely useful, but nobody cares to make any real use of the knowledge. And that's why we'll probably never survive ourselves.