So, the short review is: Brooklyn 99 is an entertaining show, full of an interesting cast of fun characters and an occasionally intriguing plot, it's a fun show to watch when you have nothing else to do.
The long review is that Brooklyn 99 isn't a super profound show, it doesn't have any big themes or mind-blowing plots. It's a fun show to watch when there's nothing to do. And that's fine. The character are well thought of, the dynamics are fun, and the plots are like Sherlock cases where the detectives solve one-episode mysteries by using information we didn't have. I don't think there's anything super special about this show in particular, but I did find myself laughing at the character's antics. It's entertaining for a quick watch if you have extra time, but not too deep to be hung up over.