"CoD got it. Halo didn't" – Black Ops 1 and 2 ports battered Halo Campaign Evolved on PlayStation last month, analyst says, because $60 for a "graphical touch-up" is a rough sell

Black Ops games in order: A man walking through a ruined city during Call of Duty Black Ops 2.

An analyst has shared why Call of Duty's Black Ops 1 and 2 ports are vastly outperforming Halo: Campaign Evolved on PlayStation.

Over on Twitter, Alinea Analytics head of market analysis Rhys Elliott posts a chart of estimates of July's best-selling games on PlayStation consoles. Activision's Call of Duty: Black Ops and Black Ops 2 ports are right at the top, with the latter estimated at 8.2 million sold, making it far and away the highest-selling game of the month, while Black Ops 1 is estimated at only 3 million.