I have visited this venue on two occasions in the past two months, and think I have experienced both the zenith and the nadir for the restaurant.
The restaurant itself is whimsical - a busy menagerie of tables tucked away in rooms, so you have what amounts to a private-lite dining experience. The waitstaff is comprised of waiters and waitresses in various fantasy style garb, playing characters as diverse as Jack Sparrow, the Queen of Hearts, Spiderman, Katniss, Finn (from Adventure Time), Nacho Libre, Marilyn Monroe, and more. The premise is that the servers are in character as they take your order and provide your entertainment.
On our first trip, we were served by the Queen of Hearts, whose accent might not have been precisely British, but she was clearly making an effort to entertain - good humour, entertained the children, and just a lilt of irreverence. She really connected with the table, which was very nice.
The second trip we were seated and then had to wait 11 minutes before our server (Marilyn Monroe) finally stopped to take our drink orders. She made almost no attempt to engage the table, and short of wearing a costume was not in character as we'd have hoped. She was passable as a server, but appeared indifferent with respect to service or entertainment. We much preferred the Queen.
The food itself is overpriced, but I expect that going in to a theme-style restaurant. You are paying for the experience as much as the food. The bread is very good, with nice flavour and a couple different butters (regular butter and cinnamon butter), and the salad bar itself is pretty basic, but satisfactory. I've not had any personal complaints about the steaks I ordered, and my son was pleased with his Chicken Parmesan, and the other kids enjoyed their kid menu items, including their "bubbling potion" (Appears to be a lemonade with food coloring added and dry ice to make the bubbles).
The restaurant offers a couple other child-friendly activities, such as face painting (which we did not do) and a balloon artist (which we did do on our first trip).
With one good visit and one not so good visit, I would probably head back again, however, I say that with the caveat that you are going to be paying a little bit more than you might at restaurants with similar food quality, so it really needs to be the entertainment that makes the trip worthwhile, and that appears to be a gamble.
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