A good is Evie is good at dodging incoming fire. Always predict your enemies's moves. If you know that kinessa is going to fire her shot, Blink or Ice block. Same goes for shalin, cassie (after dodge roll), grover and others
If going for a surprise attack or finishing off an enemy, the best tip is to blink in the air. And when youre close to your enemy FIRE. Doing this makes it easier to hit people
If you know that youre weapon is going to hit an enemy, use ice block. Becuase there's a chance that you will die before your bullet fire will hit the enemy. (Only use it when you think and know that its going to hit them)