I noticed references to Santana Row in the Assembly Row design guidelines. I happened to visit that place this past summer, so I have some impressions about it.
The first thing you noticed about Santana Row upon arriving are the vast acres devoted to free single and multi-level parking structures. You will, of course, be arriving by car -- because like most everything in San Jose, it is in the middle of severe suburban sprawl.
Despite the existence of an extremely large amount of free parking, Santana Row itself is built on a fairly wide road: at least 4 lanes, sometimes 6, on an estimated 70 foot right-of-way. As a result, there are large numbers of cars cruising up and down the street, ostensibly looking for street parking, though possibly just sightseeing.
Although the stores were not to my taste, there were a good number of people walking around there. In fact, the area had largely the same appeal as a typical shopping mall, except without a roof. In case it did rain, there was also an indoor shopping mall immediately adjacent to the area, on the other side of a large road at one end of the development.
In terms of creating a destination in the largely pedestrian-challenged South Bay area, Santana Row does appear to have been a success. If the goal was creating an actual neighborhood, it would be a complete failure. People drive their cars to walk around there, possibly shop, possibly eat, and then go home. The amenities are oriented towards the needs of a shopping mall, not a place where people regularly live and work in diverse settings. And it is not Transit-Oriented Development.
I do not know to what extent Santana Row may have influenced the design of Assembly Square. I am hoping, for the sake of the city, that it was minimal.