User blog comment:CreatorTheta/Human Evolution Theory in RWBY/@comment-3146930-20140623192955/@comment-3146930-20140623193851

Also as far as them being twice as big or just a scale, it may not be as simple as you think. Simply being twice as large doesn't mean you are twice as strong or twice as fast. A good example of this is people with gigantism, a defect that causes people to grow much larger than normal people (normally over 7-8 feet I think). Sure they are a lot bigger, but the stress on their bodies normally causes all kinds of complications and those with it tend to die early.

I prefer to think that everyone in the show is human height as even if they are twice as big, everything else is still proportional to our world so the difference in them to us by appearance alone is unimportant.