I'm not even a fan of ME (got both the games on sale on steam but not played em yet) but i'll be keeping my eye on this
You should play them kittens. ME1 has an awesome story line once you get into it, good game play as well. ME2 has awesome game play, the story line isnt so amazing imo, but still good. I just hope with ME3 that they didn't sacrifice some of the awesome single player for the co-op
Co-op is simply survival, can't imagine this took many resources. Uh, yea, I played the demo yesterday evening and I wasn't fond of it at all to be honest. The story seemed pretty cheesy from what I've seen, some things just don't make sense. (Reapers, giant spaceships, which land on earth to manually destroy one building after the other for example.) Power recharge times have gone through the roof, which forces you to do most the fighting with your weapons. "Press x to switch weapons", movement and controls seem just strange or don't behave right. There are more things which I spammed poor Jer with yesterday, but can't remember them atm.
Mass Effect 3 will be amazing!!! the mass effect 2 demo was choppy and skipped about the Jack mission not giving away any storyline