Gears of War 3 got good reviews though and most people thought it was better than gears of war 2
Yeah I know, and first week sales were much much higher than Gears 2, and yet lifetime sales were smaller.
That's why I believe Halo 4 will need exceptional reviews to have any chance to outsell Blops 2 (PS3). But it won't get those reviews. Very few games will get +90% on Meta this late in a generation.