Even though Autodesk owns both AutoCAD and Revit, it is quite ironic that the export to CAD command does not work properly. There are so many issues outlined even in 2006, and most of them are still resolved.
The most irritating is the one related to the dimensions. When I export a sheet like:
with dimensions and if I choose any option other than the “overrides BYENTITY” in the CAD Export Format dialog box:
It results in out of scale dims like:
Page setups are not similar in Revit and AutoCAD. So those don't get transferred too.
AutoCAD has a ‘nice’ printer called ‘None’ which has all the page sizes. Revit should retain the paper size from the title block and use the None printer while exporting sheets. This will not give a ‘printer missing’ error message in AutoCAD (when the DWG file is being opened), but still give the user an option to select an appropriate printer from the user’s network to print to the correct size.