Looking at the PHB1, not all classes got paragon tier feats, and only one class (Wizard) gets epic level feats. So, the assassin articles basically give us an assassin on-par with what the PHB1 provided, with the notable exception of ki focuses.
The lack of ki focus enhancements sucks, but it can be circumvented by allowing a ki focus to be enhanced with any weapon enhancement as Mike Mearls suggested.
Well, every single class to date has a multi-class feat associated with it, except for the assassin. Not only do we get to pay for most of the class now, and the rest of it later, but we get to wait a month longer than usual for it to be added to the character builder. Let's face it. We are being taken. If they aren't giving up a whole class when they say they will, they are effectively doubling the price of the class. I say forget the assassin and all other "exclusive" DDI content.