This is way easy if you have Behemoth. (At least with bots, I'm sure players wouldn't be quite as forgiving.) When it comes to the final mission, go up to each generator, and wall yourself off from all the hunters. Beat down on the generator as much as possible, and keep putting walls up when you can. Fissure and Lava Bomb are great for keeping hunters away, though they'll be distracted with the minions most of the time cause you're harder to get to. Repeat with each generator.
Plus as HolyWallrider already mentioned, there are plenty of custom options you can use to make it even easier (e.g. favor monster damage, 0 strikes, turn off handicap/autobalance, etc.)