we use autocad(2005) for all 2D, and simple 3D work like Axo/ orIsometric drawings - but we also use 3D studio Max and Viz for perspectives when we need materials/texture/ lighting. I am rubbish with computers so when we started 10 years ago, my business partner and i bought Archicad because it is sooo simple, powerful and draws (thinks) in an architectural way - so you draw a wall it has thickness - material etc etc and is in 3D, so it is a bit like modelling. Depends on what sort of drawings you want at the end of the day, but what you have is probably OK, unless you are doing "presentation" stuff.
We have found that using the 3d features in Architectural desktop we dont get as good results as we can get by modeling the building in ordinary autoCAD and then rendering it in acurender.
It will only be for structural drawings so be different line types with maybe some hatching to show different materials. No need to look fancy or colour rendred just black/white line drawings