what is this mass effect everyone talks about in here..im too lazy to look at other threads, please explain

It is a game coming out for 360 that looks fucking awesome! Check out some of the vids either under the pic or in my post in the thread here:
http://ninjashoes.net/forum/showthread.php?t=12016

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holy shit that game looks sick, i just dont like how the char is on the left of the screen, itd make a sick FPS

This game is going to be my crack for awhile when it comes out.