I find that the standard response to a new codex comes in several stages.
1. Before the codex comes out. " Oh My God! It's going to be overpowered and broken!"
2. The codex comes out. "Oh My God! It's overpowered and broken!"
3. After the codex has been around for a while. "Actually, it's not nearly as all powerful and unbeatable as we thought. But the NEXT one will be."
Repeat as needed.