Eeeeeh. I can see why the series has become so popular with children, but then children do like to be talked down to and like their characters broadly defined by one or two - one or two only - characteristics and have villains with vague, improbable plans that are easily foiled. In other words, 'The Mysterious Benedict Society' has a bad case of 'A Series of Unfortunate Events'. Eeeeh.
Not a fan.
The Mysterious Benedict Society
Next: 'The Perilous Journey'