This show is very funny and although I've missed a lot of episodes, the ones I have seen are hilarious, especially the ones involving Finch and Elliot playing an office prank on Nina.
Each character on the show is funny in their own way, Jack's irresponsibility as boss, Nina's self absorbed quality, Elliot's perfectionism and Finch's carefree attitude to name a few.
Out of all the characters, Finch would probably be the funniest as his attitude towards Jack is brilliant. Kevin is also an original character with many great lines.
Overall, seven seasons sounds about fitting for a show of this quality.