We visited Rules as 2 couples for lunch a couple of Saturday's ago. It must be said that the food simply could not be faulted, it was stunning, as was the wine and the beautiful, eloquent surroundings.
The service, however, didn't at all meet with our expectations, especially upstairs in the cocktail lounge. Quite a cold reception and very much a sense of unease about our waiter.
I did send feedback directly to the restsurant and was a little surprised to not receive a reply.
On balance i would say, the food and surroundings were fabulous, however, reading some of the other reviews, the service can be a bit hit and miss.