I'm not gonna say that I'll stop watching TVD, because I know I will watch until the end no matter what, but that doesn't keep from being extremely disappointed with the direction the writers are taking with Katherine's character and the Petrova storyline in general.
First, the Kat I know would have NEVER been so hasty with her feelings for Stefan and with her hatred for Damon. She would have waited patiently and came up with something crafty to get rid of Damon and then she would have taken her time with Stefan.
Second, the way they are portraying Kat's character in the second part of the season is humiliating. They're just basically using her as a plot device for Delena and it's obvious right from the start, at least to me, that things aren't gonna work for her. If I had known they would do this, I would have just wished for her death in the 100th episode.
Finally, Nadia is freaking 500 year old, but it doesn't show at all. Remember how easily Kat could beat Stefan and Damon when she was her 500 year old vampire self? But Nadia is getting bossed around by Damon, and even Caroline lol...
Anyway, the writers have made me lose respect for the Petrova girls and I hate them for that.