Season 8 was definitely not my favorite season, but it also wasn't my least favorite (that being Season 7). The flow earlier on in the season seemed choppy for me, and some things didn't really work or make sense (i.e. going back and forth between flashbacks and present time, Benny, Sam not looking for his brother after he DISAPPEARED). However, much like the previous season, Season 8 gets better as time goes on, and most of the things that didn't work are eventually eliminated. By the time we got to the end, we were left wanting MORE.
Even earlier on in the season had its good moments interspersed with the mediocre ones, and those usually made it worth watching. As always, wonderful job by the cast, especially Jensen Ackles, one of Hollywood's most talented yet underutilized actors.