I don't like it either. I would have liked to have a AC in the late 1400's. I don't know maybe a Templar conspiracy to avoid the discovery of America, having to protect Columbus prior to his trip and maybe protect him thru it.
Another nice setting would have been Europe During the Napoleonic Wars.
I had preordered all AC games but I haven't done the same for ACIV, pirates son'd seem appealing enough to me, ACIII was a huge disappointment. I haven't decided yet if I'm going to get Black Flag or not.