The Office is always going to be funny, but something has been a little off this season.
I'm thinking part of it has to do with the lack of any kind of drama (tension between Karen & Pam, Jan & Michael, Jim & Pam, etc. - Angela & Dwight are painful to watch, in a bad way). There's also been nothing of Michael trying to do the right thing but it being incredibly wrong (kissing Oscar, having the fat dude get up on the table after the merger, etc.).
It seems like the spent 3 years developing characters and the last 2 episodes they've boxed them into there stereotypes.
Don't get me wrong, I still laughed a lot, but the episodes just seem a lot more sterile so far this season.