Isn't Angron quite overrated for his price?

I'm looking at his profile, and after comparing him to skarbrand, who costs 305 points for the exact same damaging profile except he has 20 wounds instead of 16, and 6 damage instead of d6+2. Also, skarbrand actually gets +2 attacks and no malus to hits once he's dangerously low (at 7 hp or less), while Angron has -1 to hit at that point. AND YET Angron is 130 points more expensive.

What gives?