AJ
Haven't seen too much of her, but she seems to be okay. I think the divas should have someone of the smaller stature who can potentially be a high flyer. She fulfills the underdog requirement.
Aksana
Literally have NEVER seen her wrestle. But I find her segments with Teddy Long to be funny. If nothing else, she should stay for a comedic role.
Alicia Fox
IMO, she's pretty talented. Seems to be better than what she used to be, and seems to be getting more face time since her face turn.
Beth Phoenix
One of the top two divas wrestling wise in the company. Without her and Nattie, the division would be worse.
Bellas
Not particularly great to watch in the ring, and not the most attractive on the roster. But the twin magic works great for them and I think it's good for the business.
Eve
Much better than Kelly. I wish she would use more of the jiu jitsu (SP?) that's often mentioned by the announcers. Definitely one of the top divas and most over in the company.
Kelly Kelly
Clearly the most popular diva in the company. Say what you want, but she's improved vastly this year. Hopefully, she can continue to do so.
Natalya
The best technical female in WWE. Why she seems to be on something of a losing streak is beyond me. She and Beth SHOULD be owning the division.
Tamina
Fulfills the powerful diva criteria (guess we can say that about Beth as well.) Last time I saw her was a few months ago on Superstars. Obviously needs some work, but isn't necessarily bad. Could be a major player in time.
As far as the others, Rosa doesn't impress me at all, I like Layla, but I've never seen her go on her own, Kharma I haven't seen at all, and I'm unsure/undecided on Kaitlyn.
Though trimming the numbers may not have an impact. It's not like we really see more than Kelly, Eve, Beth, Natalya, and recently Alicia in months.