Well just completed Mass Effect 3.
Really, this was the best idea/s they could come up with, after taking your charactor through three games, what a total downer of a ending/s.
Nope, but they wanted it to end in that way. Which fair point to the complaint that your choices amount to nothing, but they had a certain story they wanted to tell and really it's not the first time your choices amount to nothing because they just have other characters filling the same roles if your choices meant someone was dead.