Wow... a Cersei apologist
. Just kidding. I think that using The Mountain to torture the lady who merely mistreated her in prison counts as "evil." Also, I'm not sure that blowing up the sept and killing probably more innocent people than ever mistreated her was very justified. Maybe "evil" is a
bit harsh, but I think that I'd put her closer to that than just "unlikable."
I see what you're suggesting, but she wasn't marketing anything by being on the show, the season is nearly a year away and it was a candid response to a question that she couldn't have known was coming. It's possible that she said it, anyways, just to be mysterious, but I'm not sure that she would if, for example, Cersei is to have a redemption in Season 8 and join with the good guys against the White Walkers. I take her answer as a possible clue that Cersei is going to continue doing Cersei things and being the #2 villain in the show, even if it jeopardizes the kingdom's chances against the #1 villain.