I think otherwise. They're all women of substance - each one is, even Uttara.
Priya - it would have been very easy to divorce Adi when she found out about his father. Running away would have been the weak thing to do. She stuck it out, and also handled the father the best she could, while not only keeping her relationship with Adi but being happy with him (till everything hit the fan recently).
Devyani - where do I even begin. This woman has sacrificed it all for the sake of her family, and done it with a smile on her face, while she was dying inside each day. In some cases she sacrificed when she should have fought, yes - like in the case of Gaurav-Vidya's marriage. And she realizes that. But for her to put up with this creep for so many years shows immense strength. And she didn't do it our of cowardice, she did it out of love for her children. It would have been cowardice, and a weak person, who would have just survived in that house. Or even given up. She LIVED there, and owned the place, and brought happiness to her children's live as best as she could - that's courage.
Vidya - again, another courageous woman. She took some time, but ultimately, to decide to give up her life and dreams and hope for the sake of the one man she can never have - that's courage. Foolhardy a bit, but courage.
Uttara - to kill her husband, to live knowing that secret and be able to smile again. To love again and to be passionate about it, even if it's the wrong path. She is the weakest of the bunch, yes, and her weakness, and her strength is her desire to be loved. She will fight to the end of the earth for those who love her. She will, I think, be Devyani's savior in the end.
One common thing all 4 have - strength to live in teh Jhakkar house. No one weak can survive in that house.
So ... summarily - all strong women. Each manifests a completely different type of strength, yet they have it inside. Innate, and silent, but very very strong.
-S