I thought this season of the show was better than the last two seasons because there was less influence of the angels and demons storyline. There were 5-6 great episodes that reminded me of the first two seasons and a great setup for season 7.
My son and I have always liked the show, but missed the beginning episodes last season. We decided to not watch any and just rent them this year when they came out. We loved watching the series on disk. We were able to watch at our own pace which really made the experience better than simply watching it on TV with commercials.
Great Season! Cas, a very multi-fascited character, plays a huge role as Season 6 sets the scence for Season 7. In this season though, they do encounter many more creatures (& Gods) and even a new breed of demon that "Dean" gets to name (Jefferson Starships)LoL. Just like wine, this show keeps getting better with time. Hope this helps!