My first alliance was kind of hardcore, they would track stats on everything. They would compare how many points your defense team “gave up” to the opponent vs. how many points you personally scored.
The leader wouldn’t shame you for it, as long as you used all of your flags… those who didn’t use all flags? Yikes… leader would call them out.
“Last war, your defense team gave up 400 points. You only used 2 flags and only scored 150 points. You just gave the opponents a 250 point advantage.”
I didn’t want to be ‘that guy’! So I made sure to use all my flags every time. And when I saw that my defense team was dying easier than our top defenses, and still giving up nearly as many points, I switched out my heroes with ones that had less HP but were still just as hard to kill. That way I wasn’t ‘giving up’ as many points to the enemy.
Example: one might think that Gormek would be a great defensive hero, because of all the HP he carries. But he’s relatively easy to kill, even compared to other red heroes with less beefy stats. So I took him out and replaced him with… I don’t even remember now, Scarlett or someone. Made my defense team a less tempting target for the opponent.
Ultimately, the overall effectiveness of your defense teams have less to do with total health points or team power, and more to do with hero synergies. I have easily wiped out high level teams that didn’t pose much of a threat defensively, and gone on to struggle against smaller level teams that had statistically weaker, but still annoyingly hard to kill heroes. Never, ever just look at the numbers and assume that the team with the higher stat points is going to be the strongest team.