I cant imagine what anyone would see in Puerto Madero beyond the relatively modest restored dikes- a few antique cranes. Everything beyond that is either old brick buildings with restaurants, which you could see in pretty much every city in North America and Europe, or mundane Miami Vice style condo buildings. I do like the costanera, as mentioned, and Mi Sueno's bondiola completo, but thats really not Puerto Madero. Most of what is now Puerto Madero was actually a big rail yard and big warehouses- the photos from the past are pretty neat- much more interesting than whats there now. There is a great aerial photo of it from 1940 that shows a Big Empty, with lots of train tracks.