I was looking for a light show to binge watch so I went through all 5 seasons of this. Weird show. The first two seasons are not unpleasant, but they suffer from two things. First, the premise of the show, a guy in his late 40s becoming a rookie, goes nowhere fast. It's mainly fodder for a couple jokes here and there and giving the opportunity to hire a seasoned and well liked actor for the part. Amusingly, this is seemingly based on the life of a friend of the producer. The second problem is that it is totally tone deaf. It's a cop show where every cop is great in a LA without gangs. It's insane. Then you have the 3rd season that overcorrects with the subtlety of an elephant in a china shop. Season 4 and 5 find a better balance on that front, it also has a cast of characters that allows to see cases from different angles (patrol, detectives, fire fighters, lawyers, attorneys, metropolitan police). The show does not do some great sociological analysis à la The Wire, but still it adds something. In these later seasons the two main problems are case-flation and a very unfortunate character.
Case-flation is the fact that the show starts with the up and downs of the mundane lives of rookie cops and then in the later seasons it's wall to wall serial killers and gang bosses and covert ops in Guatemala... It's a bit too much and not necessarily more interesting. I mean the last episode of season 5 goes to 11 in the WTF department. The unfortunate character has been mentioned, it's the rookie FBI agent which is apparently the main character of a spin-off? I have a hard time imagining that considering it's one of the most insufferable character to ever grace a TV screen. Luckily, that character only ruins two episodes and then is limited to a couple brief appearances (probably just nods at the other show).
I would only recommend to bored people who are big Nathan Fillon fans (even though they will complain there is not enough Fillion).