Wow. All of the above. But I voted for Carly, Kayla, Kristen.
Carly: My absolute favourite character from the 1990s, after she was fired from Days, I followed the actress to OLTL and later GL. Was thrilled when it was announced she was coming back. Within a month of her appearance, I was horrified, due to the horrible storytelling. And it only got worse. Temporary Bo & Hope wedge? Ick. Connected to Ms Pout? Gross. Had an affair with an apparently 12-year-old Dr McScruffy? Vomit. Then there was the doing-drugs-over-losing-Daniel tripe. She became the first character I loved that I was glad to see leave, so she couldn't be further wrecked.
Kayla: Silly return in '06, worse this time around because they had her divorce Steve to do DiMera hospital bidding and help Caroline at the Pub. Oh, and "keep an eye" on attempted murderer Jeannie Theresa. I love the actress but what a waste.
Kristen: Here's a surprise!! :wink:
LOVED Kristen back in the day, even during all the craziness. She slowly turned from a true romance for John, and a good-hearted woman, to the woman scorned. And Eileen Davidson played her so well, even after her attempts to kill Marlena, Susan, and John, you still felt a little bad for her. But she comes back, no mention of the harem, what she's been up to other than the probable lie about 'years of therapy', and it's obvious from the get-go that she's a baddie bent on revenge. A terrible waste. [And I've brain-bleached the memory of her latest return, although someone here said she returned recently, I don't recall it....]
I should have also voted "other" because Austin, Carrie, and Billie's returns were complete wastes under the last headwriters. It's almost as if since 2010 the sole intention of the suits et al at Days is to destroy every good memory I have of Days from the 1990s. :(