Sera Gamble gets a lot of crap, and I think some of it is deserved. But I will say that she *gets* the eternal combustion engine that is Dean’s love for the Impala. Season 6 actually gave us some great Impala and Dean/Impala moments.
For example, in “Mannequin 3: The Reckoning”, we learn that the Impala is not a sex doll.

The Impala’s a classy girl. You don’t just use the Impala. You love her.
And I love it when Dean defends his baby!

And now I want to cry, thinking about the end of the season.
So maybe I should take back the one or two nice things I’ve ever said about Sera Gamble.