[quote user="MJAN AG"]If Revit wasn't accurate it wouldn't be used widely[/quote]
MJAN, you are blinded by Revit-love... I envy you:-)
http://www.revitcity.com/forums.php?action=viewthread&thread_id=34496
http://revitoped.blogspot.co.uk/2012/06/dwg-files-and-funky-snapping.html
www.hokbimsolutions.com/.../detailing-and-error-line-is-slightly.html
http://forums.augi.com/archive/index.php/t-96976.html
www.revitforum.org/.../1291-accuracy-revit.html
I think that it is mainly an interoperability problem. If you are modeling in one app and you don't want to loose geometry between sessions. There is also the surfaces and healing and CNC accuracy problems.
I suppose that would be one problem you would not have on ADT.