First time at YC's today. I had been to others, years ago, so I was hopeful it would be just as good. It wasn't. The front register is so close to the door that after ONE person walks in, the rest have to line up outside.
On to the food:
Hot and sour soup wasn't hot or sour. Definitely mediocre and needed strong shots of vinegar and hot sauce, which weren't in sight. For the Mongolian BBQ portion, the peanuts were whole, which makes no sense. Not chopped? Also the sweet and sour sauce was so thin it just missed the mark. The main portions were fine, with good selections of proteins, veggies and sauces.
For ambiance: The TV had still pics of customers and was generally boring. In other words, no ambiance.
I can't recommend YC's at this point but I always give a place two tries, just in case they had an off day.