agile is a mixed bag with some quite good ideas and practices, but imo the main selling point for industry is that it allows complete dillution of compromise and responsibility, and it shows. this is why companies have bought en masse into the snakeoil and imo that's the main reason for quality problems: follow these rituals (without any regard to the core concepts behind them) and everything will be fine, and if it doesn't it was not our fault, "change is inevitable and shit happens".

also, qa is simply not optional, and agile actually stresses that pretty strongly.