I went to Dynasty a couple of weeks ago on a weekend for Dim Sum. I was impressed by the clean presentation of the restaurant, especially compared to most Dim Sum places I've visited.
The service was relatively good: polite staff who paid attention to you, and the food arrived quick (but too mysteriously TOO quick).
The quality of the food was up there for what it was, and if you like Dim Sum you probably will like this place. All in all, I would consider returning.
My only issue was with one move by the staff/management: When a table orders a dish a la carte and the table changes their mind or simply doesn't want it... DON'T try to pawn it off on another table as a "special". Seriously, stop. That's a ridiculously cheap move especially for a restaurant in Yorkville that's supposed to upscale.
Be classy Dynasty you'll be alllllright.