Ok, first, you should totally read refur's Episode Review of Doom. I sometimes laugh so hard I have drinks come out of my nose (but not anymore, I'm never drinking while reading her again ;) )
Second, I still think s4 Sam is like s1 Dean. I mean, in s1, we knew nothing about Dean, and everything about Sam. Now it's reversed. At least that's how I see it.
And yeah, he's in denile. Which is going to be tasty when it blows up in his face. Cuz it's so gonna...