Of course us urban purists would love to see "good urban design" and only that in all new developments in the city. Let's be realistic, good design is certainly important, but it's going to take a whole lot more than that to reverse the outmigration trend of the last 5 decades.
I am no fan of big box shopping centers and I haven't set foot in a mall of any sort for at least 5 years now, maybe longer. When I hear downtown workers (suburbanites or exurbanites who probably have never spent any meaningful retail dollars in Cleveland proper) talking over their cubicle walls about the easiest way to get to SYC, I say the good of this development outweighs the bad.
You can change the policies, the zoning that has hurt our cities. How do you change the perception to get people to look inward again? I would argue that development on the scale of SYC, on a highly visable brownfield site, will help change perception more than a well designed effort in downtown proper, at this point in time anyway.