I'm sorry I should have explained as others have that Revit was not started by Autodesk but acquired in April of 2002 after roughly 3 years of development by Revit Technology Corporation. Revit has always supported exporting to and import from AutoCAD. In the beginning via the Open dwg format (nobody except Autodesk can truly export to dwg format as it is proprietary, as Aaron pointed out in another thread) and now that Autodesk owns Revit is can export authentically.
Just to clarify my comment about a not being a "better dwg creator". The purpose of Revit is not to create dwg files. The purpose is to create building models and coordinated documentation (acronym "BIM", Building Information Model) within Revit's own file format and environment.
As an accommodation for differing work partners, you can provide acceptable background files, via export to dwg/dgn/dxf, for others to use as they carry out their work. To expect the exported files to pass for AutoCAD natively drafted files is currently beyond the intended scope of the export function.