Content is important. Creativity is important too. I think that there's should be some ideal mix of the two that will look different in different classrooms. I also think that educational literature that is quick to dismiss tradition and content-based learning, however broken, is ultimately unhelpful and only serves to widen the gap between sides. Likewise myopic is the claim that using technology to create more opportunities to play can only be accomplished at the expense of content. Ultimately, it's not the content or the creative technology that matters. The single most important factor in quality education is the teacher, and I fear that too much of the pedagogical literature being shared right now fails to focus on this fact (cf. ASCD "21st Century Skills" for a good assessment of this).