I've been playing FAF for years and I've gotten contradictory answers to this question. Obviously, in a 1v1, when your commander dies you lose the match.
However, in a ranked custom teamgame, there have been many times where I've personally lost my commander and all my units went up in smoke, but my team still won. I don't think I've ever really ranked down after a game like that, but that just happened last game I played and I was wondering if suicide telesnipes to take out a Yolona Oss are worth it, even if they allow my team to win.