There's a reason I grabbed the 2E Monstrous Manual

"I meant OD&D where I said 0e. When they compiled the 1e Monster Manual they imported a lot of OD&D stats without increasing their power level to accomodate the increased power of PCs from "0e" to 1e. A lot of iconic d&d monsters are less powerful than they should be as a result, in my opinion. I think that 2e dragons were more in line with where they should be relative to PC power levels."