Viewers have little love for ABC's Loving. Created in 1983 with the help of the legendary Agnes Nixon (All My Children, One Life to Live), it is the lowest-rated soap. Producer Jo Ann Emmerich, a former ABC veep, may yet rescue it, but here's the report card as of now. *Good news: Recent plots, like Angie's bone-marrow transplant, are more realistic. Nancy Addison as money- grubbing schemer Deborah is a bitchy hoot. And the theme song is still daytime's best. *Bad news: One of only two half-hour soaps, its short format makes compelling storytelling difficult. Famous grads: Luke Perry, Patricia Kalember. *Babe/hunk alert: Can't beat Amelia Heinle (Steffi) or Robert Tyler (Trucker). *Recommended dosage: The opening scenes twice a week'll do ya; avoid overdose.