you havent played Mass Effect 2 untell...
you play as a vanguard
you shoot conrad in the foot
you talked to the asari bartender on Illium
you hug Tali
you get the no one gets left behind achievement
you get drawn in by everyone's backstory
you talk to wrex again and see the cutscene
you see Legion do the robot
you threaten a man to cut his balls off and sell them to a krogan
you snap a merc's neck and kill his buddys
you keep Tali from getting expeled from the fleet
you feel sorry for conrad if you help him out (He goes "really??"

)
you hear how conrad got off world
you find out why the humans are getting taken away
you want to punch the turian councle member in the through again
you feel bad for what happen to garrus (The game has been out for 3 weeks, if you dont know what happens by now, dont blame me for spoilers)
Sorry for the long list, but you know all these are true