Psych is such a difficult show to approach I'll keep my reviews short. On one hand, the writing is terrible. The jokes and gags are the same every week and the show hasn't evolved much since the first season. Everything has gotten wackier and more silly, distorting the crime fighting aspect of the show and trivializing murder. Then there's the pathetic attempts at character development. On the other hand, the cast has enough charisma to make the show funny and likable. I find myself enjoying the show despite the trainwreck of plotting.
John Cena as Abigail's brother was cool and added a new angle to the show that didn't quite make sense. He's a government agent with an agenda, but he seems like a regular suger-agent to everyone. See the problem? His boss wants him to stop the Santa Barbara Police Department's investigation so Cena can stop the soldier dealing with the Chinese himself. The crime wasn't at the forefront of the episode, so it didn't matter much.
It looks like Abigail and Shawn are over. The writers used an easy plot device, sending Abigail to Uganda. That will probably dash their relationship, so Shawn and Juliet can come in. I never cared for Abigail and I don't really care about Juliet and Shawn (who does?) so I don't care either way. The interpersonal relationships between the characters is done so poorly, the relationships, especially the romantic ones, don't mean a thing.
Now that The Unit is over, Robert Patrick has been on NCIS, Psych, and will be in a future episode of Chuck. He's still in high demand and his acting as the tough military guy is pitch perfect.