The is a very good restaurant. Excellent? No.
The bar is nice, with great bartenders, but it's small. It's not a just a bar, it's primary function is a restaurant, so I can overlook this easily. The decor is a bit dated and dark. Not completely different from many steak houses (although this isn't a steakhouse, it's a prime rib restaurant). The prime rib is very good, but not the best I've had and most people could make better at home with a little practice. It was served hot by the chef at our table side. Nice touch. They use this huge stainless steel serving cart. But I noticed it had aluminum tape on it in several places to hide breaks in the welds. Kind of tacky. I was pleasantly surprised the beef was not too salty, which is common at many restaurants. The prime rib was juicy and easy to cut. The beef was high quality, but it had very little seasoning. I prefer some seasoning, so this took flavor away from the meat for me.
This is a loud restaurant with a lot of people. If you want a quiet romantic dinner, go elsewhere. With groups it could be a lot of fun. Prices were very reasonable, especially when compared to high-end steak places.
You can get away with wearing jeans here or a suit. You'd probably feel most comfortable somewhere in between.
I would recommend this as a place to eat in San Francisco. Many of the locals I spoke with liked it too. I think a family, friends getting together or business group is the best bet for coming here. You'll like the prime rib (and the veggies were fantastic). Enjoy.