I concur with all of the preceding posts regarding the season premier. Loved the action and the fact that they finally got together and did something. I was disappointed in last season, although they did need the character development.
And YB is right, that trough scene was tough to watch. Seriously brutal. If they can keep this vibe going they might start to rise into the Breaking Bad stratosphere. I do not think this is likely, but maybe just maybe if they can keep the season progressing like this episode.
edit: Also Carol has now climbed into my top 3 list of characters I absolutely do not want to see die.
And Glenn has officially become Hershel/Dale (the group conscience). So he will probably die this season, maybe at the end, or in the first episode of next season.