No, you can make 3
yes
no sadly you can not but you can play multiplayer as one
15 to 20 hours, (it depends in which difficulty)
Yes, Gears of War 3 is a massive multilayer online game with a cooperative campaign.
Yes, it will be the last game for the gears of war series
The hammer of dawn is only on selected levels, not all.
No its a shooter!
No, Epic Games did
If you're on about multiplayer Yes press x before the game begins, if you're on about campaign then no
gears of war is the best but gears of war 2 is better
No you can not make you own character/avatar in any gears of war because the queen escaped from the flood and if you look at the back of the gears manual at www.gearsofwar.com/gears manual it's specifically say you may create a character so do not get frustrated.
some of the best co-op campaign games are; gears of war 1,2, and soon 3; halo 1,2,3, and odst; army of two; left for dead 1,2.