Monster stat blocks are an essential part of the Dungeons & Dragons game.
They let the GM know a lot about the monster – at least they should.
What they tend to end up like is a combat block, rather than a monster stat block, focusing on combat-orientated information.
Helpful in combat, but not very complete, given the characters may want to parley or interact with the creature in other ways.
What I have developed is a modular monster stat block that will give GMs the information they need – at a glance – to run the monster in any situation.