dumbing down the population
Nowhere near as much as other channels, some of the dross on ITV and SKY fits that bill far more. You also get programmes that probably wouldn't be made by any other TV company in the the world (except maybe PBS in the states), things like some of the output of BBC 4 (excellent programme on prime numbers), horizon the other week (how long is a piece of string, delved into some interesting topics like quantum supposition and fractal geometry).