BioWare has revealed just a bit on how your choices in the first and second Mass Effects will carry over into the trilogy's conclusion. If you were disappointed with how Mass Effect 2 handled consequences, fret not, executive producer Casey Hudson assures fans that it all culminates into something rather epic in Mass Effect 3.
Speaking with PC Gamer, Hudson explained that "you're basically building towards greater and greater degrees of success, in terms of how you're able to fight the Reapers" and "combined with more personal or more moral choices about how to deal with things"¦ those things will ultimately affect part of the end game."
Hudson also notes that the game won't be impossible to complete if you made an opposing choice, like not killing off the Rachni: "If you just rip straight down the critical path and try and finish the game as soon as you can, and do very little optional or side stuff, then you can finish the game."
However, he added that doing more will certainly be very rewarding, especially when it comes to the end.
"If you really build a lot of stuff and bring people to your side and rally the entire galaxy around you, and you come into the end game with that, then you'll get an amazing, very definitive ending."
Source: PC Gamer