When you're a newer player and face harder teams in GW i think it requires you to learn more about the game. It makes you look at your toons and come up with a strategy. For example Phoenix, Zeb's stagger ability and then Ezra calling him to assist and stunning the enemy.
It also makes you look at the toons you're up against and what they can do. You know you're against Palp who can stun your whole team with 1 AOE so can you stun him using your strategy before he uses his stun? If you know Talzin can put Plague on your whole team can you stun before she pulls it off? Or get an ability block?
If you know you have an ability that removes taunt or anything like that, Ezra's Flourish for example, do you have to use it to finish off a toon or would it be better to save it incase you need it early in the next stage?
I think GW is designed for you to try to think more tactically about the battles rather than just smashing the auto button, and once you get through it a few times it becomes easier and easier