Much of Throne Room's strength comes from its versatility. Sometimes, it can be used to amplify your draw. Other times, that same Throne Room can be used to amplify your payload. The catch is that your payload needs to be actions for Throne Room to really shine (of course, it can still be good when it's just helping you draw, especially if you have strong $5+ engine components). Enter Crown: the throne room that can amplify treasure payloads. Duplicating Gold is nice, but duplicating Platinum, Capital, Bank, or Horn of Plenty is fantastic. Just like the other throne rooms, Crown isn't very good in a sloppy Silver-flood deck (though Storyteller + Crown inception seems amusingly difficult to track). Even in a bad hand, Crown is often a consolation Copper or Silver, so it's not terrible to pick up early. I like the card a lot, even if, in practice, it isn't much different from Throne Room.
I haven't played with Archive yet. I wonder if it will have a similar fate as Cartographer. Cartographer is a fine card - it always helps - but it can be tough to justify the purchase at $5. Archive seems less good in the face of junking or early greening, but better at money smoothing. I find it hard to imagine Archive fitting in well with a draw-your-deck style engine. I'm not too surprised that it does well in a moneyish strategy. I expect it is especially strong in combination with a good non-draw terminal at $3 or $4 (like Swindler, Amulet, Monument, or Militia).