I just finished all 7 seasons of this show and I have to agree with Fishy (Too frequent an occurrence lately). While the show was wildly entertaining throughout, but absolutely ridiculous. It also got a little slow and predictable toward the end. By the end of each episode, a fringe character was going to get murdered and members of the Teller/Morrow faction (whether it be Gemma, Tara, Jax, Uncer, and later Nero) would combine for at least 4 apologies.
Also, how inept are the police in Northern California? Whenever you see a law enforcement-centric show or movie (or even in real life), the police lock down the city if one of their own gets themselves perished by the hands of suspected criminals.
As I said, it was entertaining, but I found it difficult to willingly suspend my disbelief on a number of occasions throughout the show's run.