In my first (and only) full play through of ME3 when I first met the starbrat I was confused. I had done my best to avoid all spoilers and wanted to like the ending. I managed to unlock all three endings but I didn't find the starbrat remotely trustworthy.
For one, I had never seen this character before, except in my dreams that seemed to be telling me that humanity would burn. So what lead up there was to this character clearly painted it as a villain.
For two, it says that the citadel is its home and part of it, now I learned in the first game that the citadel is a reaper construct. Which caused me to draw the conclusion that this glowing kid was an agent for the reapers, just like TIM was moments earlier, the collectors were in the previous game, and Saren was in the first game. To reinforce this it gave me certain options and told me they were the only way to survive. Well, Saren said that joining the reapers was the only way to survive, I talked him out of that and got him to shoot himself. Harbinger, through the collectors, told me that resistance would only draw things out and I couldn't stop him. Proved him wrong by killing his baby human reaper thing. Finally TIM was convinced that controlling the reapers was the only way to move forward, well, I talked him out of that as well and shot him.
So here is this antagonist, servant/master/bell-boy of the reapers telling me the only way is to pick one of the choices he provided. Well, I wasn't given a choice to argue with him, so I shot him. This did nothing. So I shot the energy beam thingy, which did nothing. After shooting everything I could think of I eventually triggered the destroy ending, somehow, which was not what I wanted to do.
Now the EC comes along, I play through my same save to the starbrat and argue with it, tell it that it is wrong, and I refuse to pick genocide, dictatorship or forced change. Sticking with my morals has always work in the past, so why shouldn't it here?
So 'conventional war' has been said to be impossible, I've done the impossible before. From destroying a collector base to blowing up a mass relay. And besides, in the previous cycles the reapers always disabled the relay network so they could take the galaxy on piece meal, hell wasn't that the point of the entire first game? Maybe it was because there weren't as many as they wanted us to believe, in the codex it says that they only build, on average, a single capitol ship per cycle, since an entire race is required to be turned into slurry and pumped into a new reaper. By this point I've personally destroyed one capitol ship and a handful of the destroyers. Hell, in the battle scenes it shows reaper caps dropping left and right. Sure it takes some fire to bring them down, but there can't be THAT many. Maybe a few hundred?
The husks don't pose much of a threat, cannibals and Marauders match up to a single one of our troops at best. There are a lot more destroyers then reaper caps, but they are less dangerous and a small fleet can take them down without that much difficulty. So I figured Hackette could find a way or something.
So I told the star brat where he could shove is 'choices' and got a great few lines of Shepard being Shepard. Never give in, stick to your guns, for without them you are no better then the reapers or what this kid claims to be. And then boop, cut to 50k years later and Liara talking about how the crucible didn't work and how we all died....
Oh, and the next cycle used the crucible and are now NOT reaper food...
Really? This is what I get for sticking to my guns? A half assed ending and then being all but told that if I had done as the star brat wanted everyone I loved (Tali!) would still be around?
To use the teacher analogy mentioned earlier, this is NOT refusing to do homework and asking why I failed. This is doing all the homework, and being rewarded for it, then doing the final only to find out that I was supposed to answer the final INCORRECTLY and choose the wrong answers in order to pass, so now I fail.