So much has been discussed on this thread already; I don't really have anything new to add.
@ TM - I do agree with some of the points you've raised. However, I do not agree with tone of your post. There were a lot of expectations with the show and I do agree that so it hasn't lived up to it. The script has plenty of loopholes and the biggest weakness of the show is characterizations of the two protagonists, UB and CC. UB as far as I understand was meant to be gray but they have made her almost black. She is far to evil to be redeemable IMO, and don't understand how they will show her transformation convincingly. CC is on the other hand doesn't have much layers. And any characters needs to have some layers no matter what his/her values or personality type is. This is where the characterization becomes weak.
I fully disagree that Sanaya has only three expressions. We have seen her range in her last show and she was a revelation there, if you've seen her other show MJHT, she gave a nuanced performance there as well. Whatever the issue is here, it strictly has to do with the characterization and the script nothing to do with Sanaya's acting skills.
The cvs needs work on all these things and strike the right balance between drama, romance and comedy to make things really work.
However, all the points you made could have been said in a less condescending manner...that is, if you made this post to constructively criticize the show and not mock or bash.
@ Others - I don't see why Barun has to be dragged here or a comparison between the two jodis should be made. It is completely unnecessary to drag him in every conversation when he has nothing to do with this show.
I don't agree that if Barun was mocked by some, Sanaya should be mocked too. I am fan both and it hurts me to see either of them getting bashed or mocked and my message to solo fan-groups, if you mock the other actor to make things even, I don't see how that makes you any different from the ones who bashed your favorite.