Originally Posted by Yora
It's not that the CR system is broken. It's just that a huge number of creatures has completely wrong numbers assigned.
The CR system was broken, as the number CR didn't actually mean anything, it's just an arbitrary assignment of how tough monster feels. At the core of the d20 system is a lot of math, which the CR system ignores. There's no indication or rules for how much health, AC, or damage a creature should have at different levels, every monster is just placed where they feel right.
If CR meant something, we would have never seen the giant crabs at CR 3