I've been wanting to start for a while, but I finally got started The Office (US) a few weeks ago and just finished today.
I really liked and laughed until season 7, then it was just a descent into hell because of the departure of a certain person. I think the series should have ended there.
The last two seasons don't make much sense, we feel that the writers and producers no longer knew which direction to take for the series.
I didn't like the new characters, I found them boring and flat. They also ruined Andy's character. Not only is he not cut out to be a manager, but they completely changed his character.
It's completely ridiculous to have done everything to recover Erin back only to end their relationship a few episodes later. Her relationship with Pete has no credibility, just like the delirium with Bryan and Pam.
Cathy is useless except to heat Jim and be a green plant.
There's a parade of new useless characters, it's really weird what they've done with these last two seasons. There are a few funny moments but not as many as the first ones, even if it was starting to run out of steam a little before. Fortunately, the last 3 episodes of S9 save everything a little.