I didn't enjoy eating in the dark. It's a gimmicky restaurant attraction aimed at yuppies who want to tell their friends how hip they are. Personally, I think seeing your food and its presentation matters; it's a part of the dining experience. More importantly, the meal at O'Noir wasn't nearly good enough to stand on taste alone.
But what really upset me was that our waitress mixed up my order. I ordered lamb chops, my friend ordered lamb shank. She asked who got the lamb. When we clarified that we both did but different entrees she just put the plates down. For a while I just thought my lamb chops were dry. It wasn't till close to the end of the meal when I came across a pitiful cauliflower on my plate that we finally determined that I'd eaten her meal (which wasn't very good) and she had mine (which she said was juicy and tasty... that pissed me off). Call me an asshole, a waitress should know what's on the plates she's serving. What's more, she hit me in the head with plates. Twice.
In summary, I don't have a single positive thing to say about this place.