Last night on twitter @neven-ebrez said, “I wasn’t in the fandom for Season 6 live watching. I wonder how people interpreted early season Sam there, since he was soulless, but this was unknown to the audience. I remember knowing something was wrong but I was just waiting on the show to explain what.” [Tweet]
Challenge accepted!
Repeating @k-vichan, http://spnnewsletter.livejournal.com and https://spn-heavymeta.livejournal.com/ are gold mines of old fandom content: just go to http://supernaturalwiki.com for the date a episode first aired, and then go to the spnnewsletter/spn-heavymeta archive, select that date, and presume content will be posted over the next week or two for that episode.
This link dump of picspam recaps, reviews, meta, and speculation covers the first seven episodes of season six.
Unfortunately, because of Photobucket ransoming, a lot of old general meta (i.e. cinematography, production design, props) is effectively gone forever.