Why the heck not? It's a cool scale and very easy to figure out. One inch equals six feet. If you have figures with your model, it's very easy for somebody viewing the model to understand the true scale of the plane or tank, or whatever.
Of course, having a figure helps with any scale, but I, at least, find it easier to think of one inch being the height of a man than one inch being two-thirds the height of a man. :D
Anyway, there's some exceptionally well done models in all scales. I don't think there's any overall best scale, just the scale I like best for each kit.
Regards,
-Drew