I went to Morimoto shortly after it opened, and have a mixed opinion of it. The appetizers were pretty good, though my main course was really, really fantastic - miso-marinated black cod - which was originally a specialty at Nobu's, I think. Unfortunately, desserts were seriously lacking - the chocolate fig cake tasted disturbingly like cake mix and my sister's "chocolate wave" was basically a big tuile with a little scoop of chocolate ice cream and some sort of garnish involving kiwi - flavors that didn't really seem to match to me... The restaurant seemed a little over-designed to my taste, at the expense of function (seems to be a trend with a lot of new philly restaurants...): for example, the booth tables were so long that I, sitting on the inside, had to continually hand my plates over to the waitress because she couldn't reach them (oh, and yes, the seats are illuminated and they even change color!). I kind of got the feeling that we were paying more for the decor rather than for the food... Maybe the kitchen's settled in now that the restaurant's been open for a while?
but, it was definitely an experience, though - Hope you have a good time!