Good premise and we get more of Castiel and what's he been upto
Dean definitely shines here
I never liked the whole Samuel Colt thing, why is there a devils gate? Why is there only one gun? Why did he not build more? Let me gues literal dues ex machina... Anyway they made this premise in their first season, i guess they didn't think it through, it just irks me.
And then the bigotry of Dean, sure this phoenix killed an innocent judge and sheriff but even if he hadn't, even if they deserved to die, Dean doesn't think something not human deserves to live, he has no problem killing one for the greater good but not a human.