According to sources sounds about right
"According to Zelnick, Take-Two has now shipped 10 million units of Borderlands 2, which is a roughly 1.5 million unit increase over numbers given by the company for the shooter earlier this year. BioShock Infinite now sits at 7 million copies shipped,which is almost double what Take-Two reported back in May 2013. And finally, Civilization V sales numbers are at 6 million units shipped"
But I thought strategy games were dead