I played 2 games so far and won both. The lowest level, then the next. I have yet to challenge the hardest difficulty. Both games they took out some of our inhibs. I died very little in each game.
Honestly, I think the way to beat them is just to play safe, but take every advantage. You can't be diving in all the time, or you will lose, but they are bots and therefore dumb. You can effectively harass them and they will make poor decisions when backing. You just wait and strike.
EDIT: 1 and 2 deaths, 17 and 13 kills.
tl;dr
don't die