For the week of October 24th, Call of Duty: Black Ops and Call of Duty: Modern Warfare 2 were still the most played games on Xbox LIVE. This has to be a disappointment to EA as Battlefield 3 released this week, as it finished in third.
If you want to compare Call of Duty Black Ops to Battlefield 3. You can right now say that Battlefield 3 has under preformed at this moment. Black Ops sold a record 5 million copies on the first day and quickly became best selling video games ever. Battlefield 3 sold five million in the first week but you have to imagine that EA was expecting more, especially since Modern Warfare 3 was in two weeks.