Brent Knowles is entitled to his opinion, but that's all it is.
He's apparently disappointed because the ending didn't feature children dancing in the streets among flowers and rainbows.
Personally, I give Bioware credit for taking a chance and not going with the typical cliche ending that we're so used to seeing.
This is the second game that ends on a depressing end but hey people bitched about Bioware always sticking to cliche endings. Now were stuck with emo depressing ends where no one wins we all lose or just survive.
Like Brent Knowles I see enough of this in real life. Its a game not a real life simulator with all the grey areas. Go watch or read the news if you want drama and tragedy.