Barry wasn't boring in the Silver Age and he had plenty of life and purpose and depth. That's the thing, Barry died saving the world so Waid made Barry into a saint instead of a proper character. He neutered him by writing him in a way that made him boring and bland and he got rid of the characters wit and most of his personality. This is also true when he wrote Barry when he was alive like in Waid's Flash and Green Lantern: The Brave and the Bold.