Mass Effect 3 video shows off Shep, teamwork, and a mech?

We have gotten the new Mass Effect 3 gameplay video fresh from Gamescom 2011 and it looks gooooooooood! I can describe it for you but you know you will watch it anyway, so sit back and enjoy the fire fight then mark March 6th, 2012 on your calendar as the day you will kiss your social life goodbye.