I still maintain that you're not supposed to "feel" for the kid, but appreciate what the kid represents enough for it to resonate.
It still fails in that aspect too. Personifying all the pain, suffering, and death that is happening and putting it onto one person and feeling upset about it really misses the mark a lot.
To compare it to something, it's like the scene in Black Hawk Down near the end when the U.N. Convoy is leaving the city on the Mogadishu Mile at daybreak and the Humvee stops as an old man carries the body of a child past him. That scene was supposed to personify the carnage taking place, and it was a simpler, much more succinct summation, and much more powerfully resonating theme because of it, whereas in ME3, everything keeps going back to this one child. It borders on narm territory, especially since you never see much of the rest of the carnage of the war, or its affect on people.
I'd still argue against the forced characterization, but I at least wouldn't be complaining that it is in and of itself bad.