The most important problem with advertising is that it is competive waste:
If firms A and B can create a product a cost $X that sells for $X+$Y firm B can create the same product for $X, then A and B will waste $Y on advertising in an attempt to win consumers for each other, for no benefit to anyone (except in any artistic/entertainment value in the advertising, and the possibly useful wealth-redistribution from firm's owners to advertising employees).