I've always been dissatisfied when hearing some sort of singing group like a chorus try to sing a pop song.  It always gets butchered.  Somewhere in the history of music education, somebody decided that singing with a British accent is the "right" way to sing.  Ever since then, nobody pronounces R's when singing.  So when a group of singing people gets together and tries to cover music that wasn't originally sung by a professionally-trained singer, it always sounds bad.  I think we tend to deal with it because, eh, it's better than opera or show tunes.  But really, it sounds horrible.  Please stop. #entertainment