do it this way, when you import character a model into med set it`s scale to 1.0, then look at it in wed and see how it is scaled in comparison to your buildings, if to big reimport as 0.8 and work down (or up) till you get the scale right.
How i do it is like this, i import all my models into ultimate unwrap 3d. i scale to 20000 in there (it`s like uu set scale) then when i import into med i set scale on all models to 1.0 works perfectly