The season finale was awesome, the scene at the beginning showing that massive hoard zombies coming from Atlanta following that helicopter to the farm was a perfect opener for the episode, then the whole farm situation was great (I was the only one who thought in Night on the Living Dead during that scene?) and I'm really glad that they "lost" that battle against the walkers; Jimmy and Patricia died and the place they considered safe was destroyed, that's a lose in my book.
But the awesomeness don't stop there. Now we have a Rick hated by his family (it's official, Lori it's the most stupid bitch on the show) and most of the members of the group because he killed Shane and didn't tell them about the infection and he wants to turn the group into a dictatorship (his new nickname should be Ricktator lol).
And the best moment of the episode, FUCKIN' MICHONNE!!!!! She appears only for a moment, but men, I got really excited, now finally the show will have a badass women. Ahhh, and I'm pretty sure that "castle" hidden in the mountains at the end of the episode is THE FUCKING JAIL!!!!!!
Overall, finale had a lot of gore, a lot of resolve, and a lot of setup for next season. Now the sad part is to wait until october for the next season.