The only one I agree.

Caroline started awfully, became great & then she went downhill again IMO.
I liked Elena better as a vampire
Bonnie is unlucky but the most of them are unlucky
S5 is not the worst for me. Probably S7 is.

For me it was season 1-3. I was kinda neutral on her then, but tbh from season 4 onwards I didn't like her at all.

Never had that much of an opinion on Caroline.

I agree, season 5 was the worst! But, if I remember correctly, that was Paul Wesley's Silas' season, right? He was fun to watch, at least.

I agree that Katherine wasn't a good girlfriend but I still love her with Stefan, lol.

Bonnie definitely has it the worst in TVD, I agree with that.

I agree with the one about Caroline too. I'm not sure if season 5 was the worst, but one of my least favorites for sure

I couldn't stand Caroline at first, but when she became a vampire, she got a lot better, and by the end she was one of my favourites.

I liked Elena better in seasons 4-6 than the first ones. Nina Dobrev had grown more as an actress and human Elena was like crying all the time. Vampire Elena had the same trouble but she still tried to have some fun. And I liked her more with Damon than with Stefan. I only “hated" Caroline in the first season. And Season 5 was one of the best seasons, according to me (season 3,4,5 and 6)