I'm still into AC and last time i checked Unity is consistently in the top 5 or thereabout in the UK sales charts.
I just love the quasi realistic historical settings, mixed with conspiracy theories. The switching of settings makes it not get old.
They should work on the gameplay, though. Controls are still kinda sluggish and awkward. And they took way too much out in Unity in terms of control options (one example is not being able to fight bare hands anymore).