That was a very good episode last night. Its only probably is that it wasn't a season finale. Nothing was really wrapped up, no big world changing event happened to the characters, and a bunch of plot threads weren't even mentioned. It feels like episode 8 of a 13 episode series, where they know they have 5 more episodes before things have to really come together. Overall this was a great season, better then the last (although Season 5 was solid), but it feels like we stopped 2/3rds of the way through it. Maybe they'll have a big special next year, something like like "All The and Gargantua-2", which was basically the season finale of Season 5 but aired awhile after that season ended.
Overall though, I loved the season. I did miss Dr. Morpheus and the order of the triad a lot, and I wasn't very interested in Hank's subplot with Wide Whale's daughter, but besides that it was very enjoyable, and its going to be a rough 2-3 years until the next season.