Complex and Multi-layered Storytelling, Multidimensional Characters and A Shifting Timeline. It's a very fulfilling series, with a tempting, complex storyline that unveils itself at a bludgeoning pace, slowly at times leaving you in dire need for answers and rapidly at times, throwing so many answers at you that you haven't even asked a question for yet.
The timeline is harsh and unforgiving, you will have to wait for answers and when they come, you may not be satisfied, but you will and -I can't stress this enough-, WANT MORE.
Once you start, you really can't stop, it will navigate you through a sea of cliffhangers, masterfully crafted to give you just enough info to hook so you would stick through with it, not enough to numb you and bore you, just enough to make you want more.
Deep characters and great pace of character development.
Everything you would wish for in a show, not to mention how compelling and addictive the show is. Just watch it.