As many of you are aware - there is currently a movement in community design circles away from supertall buildings towards more modest buildings. There are a number of arguments against supertalls, some of which are bunk and some of which have merit. One of the arguments that I think has some merit is the economic argument, which is demonstrated in the Moscow example.
The build-it-and-they-will-come philosophy doesn't work with most real estate development. Each market area only has so much demand, for residential space, for office space and for retail space. If the demand isn't there then a supertall building is just going to absorb the entire market for a number of years, sterilizing the whole market. For example, if there is predicted a demand for 1 million sq.ft of new office space over then next ten years it is wiser to build 100,000 sq.ft. per year rather than building 1 million sq.ft. in year one and not building anything for the remaining nine years. Smaller buildings are make your city more resilient to economic changes and are more cost effective.
From an community design point-of-view there is a balance that needs to be maintained between concentrating people within a walkable area and spreading the floor area so out you don't get a few supertalls surrounded by vacant lots. If you're trying to create a vibrant city core a one square mile neighborhood chock full of mid-rise buildings is better than a handful of supertalls surrounded by derelict buildings and vacant lots.
From an architectural and city-pride point-of-view Supertall buildings are cool, but you can't let that overshadow how the city actually works.