First of all, yes, it's very busy, especially on weekends. E.g. we went there on Saturday at 6PM without a reservation and their waiting time was 45 minutes for a table for 2. Hey, I like the place for its close proximity to our home, for their consistently good California roll with a crab mix, pork tenderloin entree, avocado egg roll, but it's not worth waiting 45 minutes. It's just a place to crash when you're hungry and you don't feel like driving to Scottsdale. The service here is not impressive, usually you will get a "difficult to catch waiter" type, but it's always better on weekdays. Martinis are hit or miss (I guess depends on a barman) and my favorite so far is a raspberry crush with floating fresh raspberry in it.
Never had a chance to check their happy hour menu as we don't like their bar/patio scene and you cannot get a happy hour menu if you want to seat inside of the restaurant.
I'd give it 3.5 stars and definitely will go again. Am I too kind? ;)