User blog comment:Damac1214/Why Call of Duty is Call of Duty, Fallout is Fallout, Halo is Halo, and that they aren't going to be changing anytime soon/@comment-1854594-20130314080113/@comment-1187559-20130315152838

A better example may of been between 3 and New Vegas, since 2 and 3 was quite the radical change since the series had changed hands.