Frankly, I don't get it.
Browsers have been copying each other since the dawn of time, and the press didn't seem to care much. Things like Speed Dial, popup blocking, full page zoom, sessions, private data deletion, and so on, were invented or pioneered by Opera, and are in use by other browsers today. Opera has also added features that were first seen in other browsers, such as private browsing and extensions.
Why do they care about this only now?
And as far as I can tell, the ideas in RockMelt aren't exactly novel, new or revolutionary either. Remember Flock?