This place is overpriced, yes, but at least it's better than the nearby PF Changs.
All of the food I've had at Hannah's is passably good, no real reason to complain at least. They manage to make a pretty decent reproduction of the Yellowtail with Jalepeno dish that you can find at NOBU (which is the world-class sushi restaurant located at the Hard Rock) -- however, this particular dish is pretty much the only reason I ever go.
The atmosphere is kind of neat, though. They have water running under see-through tiles on the floor, and also have aquarium-like glass stuctures that act as tables.