Ember is not marketed as being for a specific type of app, and not for others. The sole hint to kind of app is "ambitious apps." As a reader, that seems like a challenge. Oh, I don't think ember is right for me? Must not be ambitious. Nowhere on the site that I can see is there a discussion of fit, or tradeoffs.

I'm not attacking Ember specifically. All the MVC frameworks' sites are the same in this regard: breathless boosterism, slathered in benefit-speke.

Hence the perception that it's a silver bullet.