My take on each...
Melina - always had heat on her, so this was overdue. I will say this much, she stood out from the other women, most of whom I can't tell apart. Melina Perez is her real name I believe, so that will help her.
Kozlov - I think they squeezed everything they could out of this guy. He had a main event run, and as worked back down the card. I don't think much of him. He was discovered by Jerry Jarrett, who shopped him to Vince at Titan Towers, which led to heat between Jerry & Jeff. KOZLOV, of all people, came between a father and son. Amazing.
Gail Kim - see other posts. Best worker on the roster by far, but that doesn't matter much. Interesting thing about Kim, is along with Kong in TNA, she was the last woman to really move ratings in wrestling since Sable. And they did it without pushing sex. WWE keeps pushing sex, and literally nobody cares.
DH Smith - he is dry, he is boring, but he's is big, he can work, and he has the bloodlines they love. So I don't get it. Ted DiBiase Jr is the absolute shits, and he sticks around. Whatever.
Chris Masters - I love the guy, but its pretty well known that HHH isn't a fan, so this is no shock since Trips is the personel guy now.