I have to be honest; this was initially hard to get into. This was due, in my case, to the fact that I wasn't sure what this show was originally supposed to be focused on. During the initial launch, it seemed to be tied more into Charles Manson and the Tate-LaBianca murders and I thought that the series would be focused on the officers and detectives that caught the case. Not true. THis was a gritty, film noirish, slice of sixties life, after the "summer of love" and touches on politics, family, dissolution with the Vietnam war, communes, race relations, the good and bad of police forces and their employees, women in the workforce, crimes unrelated to the Manson murders and many other issues of the time.
The scripts were well written and casting was excellent. You will see many familiar faces and of the new ones, many that you should see again. I especially enjoyed the work of David Duchovny and Grey Damon, who played the two detective leads. Also very good were Gethin Anthony (Manson), Claire Holt and Michaela McManus. But honestly, I found most of the characters realistic and the roles well acted.
During the two seasons, the creative team covered a lot of varied stories and they provided a satisfying ending to the series. I am not sure that it is necessary for this show to return for a third season, but if it does, I will definitely tune in.
Hope you give this series a chance as it is worth it!