Take notice of when an enemy is marked by Corvus, as they will receive healing at any distance any time Corvus heals. Corvus's heal is also more effective when used directly on marked targets, so attack unmarked enemies to force him to shift focus.
Don't neglect Corvus's damage, his weapon has about the highest potential DPS in the support class. If he's focused on fighting you, keep mobile to throw off his tracking.
Terminus's Power Siphon gives him unlimited damage absorption in the direction it's aimed in, but it has limited charge. Try to put him under pressure and make him waste its charge until he's vulnerable, but be careful to not hit the siphon too much.
Crowd control reduction or immunity is critical against Atlas, especially if you are a tank or support. This will make you less vulnerable to his Rewind effect, and reduce the time you are trapped by his ultimate.
When going for Io, be wary of Luna, as her stun will track you and knock you down if you are airborne. Luna is otherwise an easy target to poke down if you don't have a better target, either killing her or forcing Io to pull her back to safety.