I'm studying English Lit, Welsh, French and Drama&Theatre Studies, currently sitting A Levels.
Now Drama&Theatre Studies is widely regarded as a "soft" subject- but generally when the course a student takes is one without much written element. The course I'm doing comprises of a lot of written coursework, timed essay papers which draw out questions of history and writing technique, and also performances that have to be written, scripted, analysed and reviewed.
Contrary to popular belief, drama isn't only about flouncing around a theatre swooning and sighing "but darling, what's my motivation?"
I think that essay questions are more demanding than maths and science- in SOME ways. They require you to think, form opinions and express yourself fluently and originally- whereas in maths and science it's a case of learning solid fact, complex formulae and equations.
One advantage is that in "fact" subjects you are either right or wrong- in languages and literature, it relies heavily on how the examiner responds.
Welsh could potentially be seen as a soft subject to those living outside of Wales too. Luckily, Universities acknowledge it as a serious subject and accept it as an A Level.