I have always thought that Odaiba is underrated. It is a great little island to visit for the day to take in some shopping at venus fort or the other shopping galleries. There are many restaurants that offer an incredible view of the Rainbow Bridge at night. As for the Park, I wouldn't even compare it to an American park just like I wouldn't compare and American Park to Odaiba's. It is a nice place to relax and unwind and watch the boats go by with a backdrop setting of the Rainbow Bridge. If anything, it is more exciting than most parks because you are able to watch something other than the wind blowing in the trees.
I really don't have anything positive to say about most towers: Seattle, Auckland, Vancouver and the Tokyo Tower is no exception. Even worse, they don't even have a proper restaurant on the top floor. Perhaps this is a good thing, however, since most tower restaurants have mediocre food b/c you are paying for the view. The restaurants at the Tokyo Tower are fast food only such as Baskin Robbins and burger chains. The majority of tourists are high school kids on an outing. But see for yourself, you should experience it at least once, for the view.