I will really appreciate a clear, objective and fresh feedback about that.
It's possible currently, use Autocad 2011 with Lion in a brand new mac??
If you want to install AutoCAD 2011 for Mac on LION, please install all the severice packs after you install AutoCAD 2011.
You can get the severice pace from the following link:
Hope this will helpful to you.
Autodesk Test Engineer