Personally I think it's still MUCH more comfortable if one can see the artist's name and the album title - for classical music even the name of the orchestra/conductor etc. - it also helps you to sort the files you've just downloaded!
There are some nice utilities out there for renaming large lists of files which can insert text at the beginnig or end, add index numbers and so on, try for example Rname-it v3.11, which can be found at http://members.nbci.com/_XMCM/listerman/fileutil.html :-)