The arguing about who is the worst character is hilarious.
Shirley is vile but she is also funny, and occasionally sensitive. She is also pig-headed, stubborn, and rough as a buzzard's crutch. I wouldn't want her as my mate, would any of you? She might be a laugh to go and get drunk with but she also might smack you one at the end of the night if you looked at her wrong. Also, she 'works' in Blades but never appears to wash her hair.
As for who is or isn't the worst character in EE, so far the only person with no flaws whatsoever is Ollie and that's only because he's too young.