[quote user="Jon Summers"]
Unfortunately most people can't interpret a rotation matrix: I blame the government.
[/quote]
Yes, I certainly don't recall it being on my secondary school mathematics curriculum though I do wish it was. It would have made my progression into programming somewhat easier.
I do already have a function for converting the angle result, I was just curious why the output value didn't follow the convention of CCW rotation however the point is indeed moot.