https://www.vulture.com/2019/01/brooklyn-nine-nine-season-6-nbc-review.html

Judging from the first two episodes of Season 6, Brooklyn Nine-Nine has made a successful transition after being canceled at Fox. "Even better, the new season of Brooklyn Nine-Nine seems to be doing exactly what any show in its sixth season should do," says Kathryn VanArendonk. "It’s not reinventing itself whole cloth, but it does look like the writers asked themselves how best to use this gift of more time, and what else Brooklyn Nine-Nine might have to say about the world right now." She notes that Brooklyn Nine-Nine is "more out loud about what it means to be a cop show in 2019. It’s a noticeable choice for the show, which could so easily have pivoted straight toward a greatest-hits plan for this sixth season. Thank goodness it didn’t."

ALSO:

Brooklyn Nine-Nine is starting to explicitly address the elephant in the room: that it's a cop show when police brutality is a hot-button issue (https://www.polygon.com/tv/2019/1/10/18165575/brooklyn-nine-nine-season-6-review-recap)
Brooklyn Nine-Nine makes the transition without skipping a beat (https://www.hollywoodreporter.com/review/brooklyn-nine-nine-review-season-6-1175213)
This could be the most complex and emotional season yet (https://www.bustle.com/p/why-brooklyn-nine-nine-season-6-will-be-the-most-complex-emotional-season-yet-according-to-the-cast-15519276)
How will Brooklyn Nine-Nine do in its new timeslot on NBC? (https://www.thewrap.com/brooklyn-nine-nine-tv-ratings-nbc-premiere-fox-season/)
Here are 21 Brooklyn Nine-Nine facts from Dan Goor's Reddit AMA (https://www.buzzfeed.com/noradominick/brooklyn-nine-nine-secrets-every-super-fan-should-know)
Every Brooklyn Nine-Nine episode, ranked (https://www.vulture.com/article/best-brooklyn-nine-nine-episodes.html)
Although NBC allows for "bleeping and blurring," unlike Fox, Brooklyn Nine-Nine will stay a family-friendly show (https://variety.com/2019/tv/features/brooklyn-nine-nine-season-6-dan-goor-interview-1203091843)