Resident Evil 6 has not reviewed well, but that hasn't stopped it from becoming the most shipped game in Capcom history, with the publisher reporting that 4.5 million units have been shipped to retailers already. That is a pretty big number.
It's worth noting that this number does not represent the amount of copies sold, just the amount shipped to retailers.
As a comparison, Resident Evil 5 managed to ship 4 million units at launch and that game ultimately managed to sell 5.8 million copies.
Capcom has previously stated it expects Resident Evil 6 to sell 7 million, and it does have a chance at making that, considering these current numbers, but you have to wonder if poor reviews and subsequent poor word of mouth will affect sales in the long term? Hard to say, but Resident Evil 6 might not have the same sales tail off its predecessors did. Time will tell.
Resident Evil 6 Ships 4.5 Million Copies Worldwide [Siliconera]