This season was jam-packed with a convoluted plot. I wasn't sure how it was going to tie together to lead to a fifth season, but the writers found a way that surprised me (which is hard to do) and one which wasn't a deus ex machina.
There were plenty of titties, lots of violence and solid acting. I'm not a fan of the actress who plays Tara, but the rest of the cast does a great job. It's weird seeing bit characters from the Shield, but they're both FX shows so I guess I shouldn't be too surprised.
I highly recommend this season and this series. It will not disappoint.