No still sucks big time ...
This used to work in previous versions:
Try importing an mp3 file with a period in it (apart from the one before the file extension)
e.g. 01. Shaw Taylor Joanne - Going Home.mp3
It won't do anything - or rather it will ignore the file as it assumes it is not a valid audio file
Remove the . after 01 and it works ...
Found that by trial and error .... so now I'm going to do a DIR /S *.*.mp3 from my Music library root folder to identity other 'problem' files that iTunes 11 can not handle