I hate seeing the featured artist in the song title. It just looks messy. Thank God iTunes has separate info sections for song artist and album artist.
tbh, if the feature is irrelevant, I remove them..
if I like the song just because of the feature and not the artist, I change the artist to one that is featuring..
if I like both the artist and the feature, then I usually try and pick the one I like the most.. I just hate anything with feature in it
None at all.
Having the name of the featured artist/s just makes my iTunes look so messy.
I've seen some monstrosities throughout my life though - [fT.] and (FEAT.) being the worst of the bunch.
It depends on the featured artist. For example: Brandy & Monica for The Boy is Mine, Nicki Minaj feat. Rihanna for Fly, and Maroon 5 stands alone on Moves Like Jagger.