Tessa Wong's piece on how every mall in Singapore tends to have the same shops these days is right on the money. Although it leads to questions about whether malls should be the sites of diversity, versus individual shops that extend out onto the street. Even the festival markets of the US - Quincy Market etc. - seem to have lots of chains in my experience.
As an aside in this Jane Jacobs vein: I do like that the ground-level shops of Ion and Orchard Central have doors that actually open out onto the street, rather than just a window display that forces you to enter the mall first. I'm not sold on the luxury goods being sold at Ion, but this is a good trend.
The most interesting shopping centres in Singapore to me are the old ones - Peninsula Plaza and Shopping Centre, Far East Plaza (and Far East Shopping Centre, come to think of it), Tanglin Shopping Centre. All these old shops, selling niche products and services.