We've been on lots of Carnival cruises, but never tried the Chef's Table. Personally, I didn't think I'd care for all the fancy food.
On the recent John Heald's Bloggers Cruise 7, I purchased a number of raffle tickets for an assortment of prizes and managed to win one of the Chef's Table dinner for two, hosted by John Heald and Calvin.
I surprised myself and ate everything and enjoyed it. The Chef's Table is pricy, but think the first time was not the last we will do it.
In terms of value, I would still rank MDR as number 1, then the steakhouse, and then Chef's Table but think Chef's Table will occasionally be in our rotation.