I start to worry about the game when we can say "You should never not take Palpatine" and have it not be hyperbole.
I do know Defenders hit hard and now tank damage well with X7, particularly when combined with Stealth Device. My poor Jake & crack A-wings simply cried at their inability to push damage through three X7 Stealth Defenders (Five hit proton rocket? ... Equals no damage to two evades, two eyeballs, focus token, and evade token. Sigh ...).
On the other hand, I did have my full health X7 Ryad erased in one shot by a Bossk Party Bus. So there's that: "Green dice will betray you eventually. Love, Ryad."
The designers aren't particularly good at their job. I don't think they understand that damage mitigation should not surpass offense. The game just turns off at a certain point when it becomes impossible to damage anything.
Defensive cards should be like elusiveness or sensor jammer. They shouldn't just feed you evade results automatically with no cost. And "guessing" zero for C-3PO is not guessing, there should be some actual risk involved in playing that card.
The design team changed before wave 4. Look at how much obnoxious crap has come out since then.