I would say that the 5th season have made a big progress in major plot. When we feel like this is just another season with all the gags and giglings, the director just surprises us with Michael lefting DM and starting his own business. Meanwhile, we, the audience, start to see the other side of all characters. Pam follows Michael’s way with her guts and becomes a salesman eventually. Michael shows ability of his convincing skills, even though he still didn’t work out how to run his own company. Andy becomes kinda cute, he makes friends with Dwight and is being nice to Jim. Mike loses Dwight’s loyalty and Jim tries to be a butt-kisser for the first time, while Dwight makes a good prank on J&P. (Can you believe this?) It’s just so good to know that everyone is complicated, human beings are complicated.
Though I haven’t finish this season yet, I kinda know that Mike and Holly are getting back together (the abstract on Netflix is such a spoiler), and I’m thrilled with that too. So with all these factors I listed above, this is definitely the best season so far for me.
Update: OK so the word “REUNITED” doesn’t mean they are getting back together. That’s a bummer since they are apparently the soulmate to each other. But Pam’s pregnet so yay still my favourite season! XD