Chris Y.
Yelp
The Shinsekai Market area is an interesting one for sure.
You would have to actually get here at exactly the right time for it to be super busy, but otherwise, it's mostly a fairly lower foot traffic area, with many shops opened for short amounts of time throughout the day.
The main Shinsekai Market is actually just a small stretch of the market in this shopping area after you get out of the station. The market is, really nothing spectacular, and I would just recommend going to Kuromon if you were just in a mood for shopping at a full on market, and getting that experience.
This small shopping area is not the main Shinsekai epicenter of activity, so it's really more of a walkway more than anything. There are a few restaurants here that I'd recommend, but for the most part, the big hitters are really towards the back end as you head close to the Zoo entrance, so outside of a couple of places, I wouldn't dawdle here too much.