In his most recent post Lukas Smith suggests that good design isn't an excuse for wasting time. He's basically saying that Symfony2, because of how it's designed and implemented, isn't a RAD (rapid application development) framework and that it's about time for some layers to be added to help get it there.
Symfony 1.x I would put into a category of frameworks focused on RAD, aka rapid application development. [...] So for those people who were happy focusing on the 80% use case Symfony2 is a step back. Suddenly the same features take longer to implement, take longer to modify later on and on top of that the learning curve is steeper.
He suggests that work be put into "RAD layers" that can sit on top of Symfony2 and provide some of the more familiar features people are used to from things like CakePHP, Yii and CodeIgniter. There's been a few tries to accomplish this with only one getting the closest in his opinion - the KnpBundle.