Here is an article on the stats of the beta:
Microsoft released a host of figures today related to the recently completed Gears of War 3 Beta. While many of them are impressive, perhaps the most impressive is the sheer number of participants. Care to hazard a guess? No? Well, here it is:
1.29 million
That's right, 1,290,000 people logged into the beta at some point over its 4 week run. Those participants, who represented 143 countries, logged in a combined 249 years worth of gameplay during the Multiplayer Beta period.
Perhaps these stats make it unsurprising that Gears of War 3 also became the fastest-ever Xbox exclusive title to surpass one million pre-orders.
Several other stats were also made available:
· More than 11 million matches completed
· More than 927 million kills recorded
· More than 131 million executions performed
· More than 23 million deaths by chainsaw
· Nearly 23 BILLION bullets fired
· 460 million ribbons and 294 million medals earned
· 435 thousand people earned the beta exclusive Thrashball Cole skin to use in the retail game when it launches in September
· 234 thousand people earned the beta exclusive Gold Retro Lancer to use in the retail game when it launches in September
http://www.trueachievements.com/n3806/gears-of-war-3-beta-statistics.htm