The last few seasons were criticized for a dip in quality. The sixth season received criticisms for a lack of stakes for the characters, particularly Jim and Pam. "The Office" co-creator Ricky Gervais wrote in his blog, referring to "Search Committee," particularly Warren Buffett's guest appearance, "If you're going to jump a shark, jump a big one," and compared the episode to the Chris Martin episode of Gervais' other series, "Extras" (although he later said on his website, "I fucking didn't "The Office", that's for sure"). Some critics said the series should have ended after the departure of Steve Carell. In an IAmA interview on Reddit, Rainn Wilson felt that the eighth season possessed some mistakes "creatively," such as the chemistry between Spader and Helms, which he called "a bit dark" and argued that the show should have gone for a "brighter and more energized" relationship. Despite this, there are later-series episodes that have received critical acclaim, including "Niagara", "Garage Sale", "Goodbye, Michael", "Dwight Christmas", "A.A.R.M.", and "Finale".