Despite the Gintama series being my favorite anime, these 13 episodes lacked the soul of the previous 252 episodes. This was really quite a let down set of episodes.
There is very little humor throughout these episodes. There are 3 story sets (Starting on eps 1/5/10) and a single episode (13). Episode 6,7,8 were pretty well done combat and story wise and 13 was very good, but the rest just strayed away from Gintama and didn't capture the anime well. Clearly there were some issues with creativity or otherwise as it is extremely unusual for a run to have such few episodes, furthered by the gap that the next gintama run is 3 years later (2015).
The characters aside from the regular crew in eps 1-4 and 10-12 just don't feel right. The "stories" were just not exciting or matched the rest of its previous episodes.
As it stands, this season has to be rated for what is there, whether it was an attempt at a new direction as it didn't follow the usualy style, it ultimately missed the mark. If it wasn't for the 4 good episodes mentioned, the score would be extremely low which is hard to say being a major Gintama fan.