When Io deploys Luna, you can use Broadside to deal big damage or force Io to move her, leaving Luna further from the middle of the field and on a cooldown. With Bulldozer, you can take Luna down with a single rclick, keeping it from the point.
Void Grip makes him an easy target for your team, although it also leaves you vulnerable to his Grumpy Bomb. Void Grip him when you can quickly escape behind a wall so he or his allies don't punish your open defenses.
Don't solely rely on In Pursuit to take her down. Use Combat Slide often to reposition yourself; it may help you avoid a Pounce. Missing could mean death, so don't jump or spamclick, as those lower your accuracy. Death Hastens is ideal against Maeve.
When dealing with Strix, it is paramount that you get the jump on him. Try to aim your Net Shot during Heroic Leap, and with Ensnare he'll go down fast. Strix has the lowest walk speed in the game, so even in his stealth he won't be moving too much.
Use your Power Siphon to absorb his shots, and get behind a wall to recharge it. If you're running Decimation, you can shred half of his health down at max charge for your flanks/damages to finish him off, or at least force him to retreat and heal.