Hi, this is a question I should have asked a long time ago.
In Arcgis 10.4 the DWG/DXF Import with "Add Data" does not create the same results als in 10.1 (or 10.0).
The blocks/inserts are not graphically converted, only as points. On the other hand, every Block gets its own point-feature, which can lead to several thousand features in a huge group, and therefore to a very long insertion time.
The "Cad To Database" tool has the same problem, takes significantly more time and additionally often generates "Error 00354: The name contains invalid characters".
For larger drawings (for instance, plants in engineering are mostly made of inserts), I have to explode those blocks (and nested inserts), which can take a very long time, losing block informations like Layer, Block name, Attributes.
Am I missing something ? How could I import Dwg/Dxf like with the old (not perfect, but more usable) mode ?