I'm not sure I'd call this hotel 'outstanding'. It's a standard-issue, convention-style Marriott, done in a European, not Asian style. The beds are not the nice, plushy ones found in the US, but are rather low, with thin mattresses, and limited bedding. The rooms are small, big enough for two but no more. The breakfast and evening snacks in the concierge lounge are not up to the standards of most Marriotts in the US, and a far cry from other non-US Marriotts, such as Singapore. Finding a staff member who speaks fluent English is hit or miss, although they are unfailingly polite of course. The bars and tea lounge can be smoky, but hey, this is Japan, not the US.
There are a few good things which stood out for me: The location is superb. The high-def TV is great. The health club is quite nice and the shiatsu massage in the spa is unbelievable, the best massage I have ever had in Japan. Lastly, skip the dreary breakfast buffet in the concierge lounge and head for the Ka-Un restaurant for their wonderful Japanese breakfast.