I want to offer some more general thoughts that pertain to the current Shanghai metro system:
1. After I mentioned that Line 11 has been almost completely useless to me until recently (now it is only 90% useless because at least it can get me to Jiangsu Rd, where a friend of mine works), I realized that some of the newer lines are even more useless (for me)
https://exploreshanghai.com/metro/#
-17
-5
-6
-8 I have taken 8 one or two stops a few times, though
-3
2. Lines that I like and/or need
-10 I live and work on Line 10 because it is much more civilized than Line 2, and passes through a lot of useful places
-13 I like 13 because I can almost always get a seat, and it connects my office to Nanjing West as well as Hanzhong Road (we have clients there); it also hits some decent areas after it turns west at Hanzhong Road
-12 Not quite as useful as 13 because it turns east at Hanzhong Road, but it's still a good north/south option through town, and the stations seem to spaced a little further apart than 13's
-1 While I've never been a fan of 1, I appreciate it a little more now because it allows me to go both east, and north from Xujiahui/Hengshan Road, and passes by Shaanxi South Road as well as Huangpi South Road (north end of XTD)
3. Lines that I dislike, but sometimes use out of necessity
-2 Most people say, probably correctly, that 2 is the most important line in the network. While I can tolerate it for 2-3 station runs, I dislike the crowds, and the downtown stations are not conveniently placed (e.g. if you want to go Plaza 66 or the Portman, you're looking at 800-1000 meter walks)
-7 Line 7 barely connects to lines 1 and 2, and does not connect with line 10, in spite of the fact that they cross each other. It is also quite crowded (not sure why)
-9 I'm lukewarm about 9. It is crowded because many people live in Songjiang these days, and I get this. It does the same cross town job as 2 and 10...just further south. Like 10 and 1, it can also get me from my home to XTD (Madang Road in this case)
4. Line 14 (2020 launch planned)
https://en.wikipedia.org/wiki/Line_14_(Shanghai_Metro)
-Line 14 is yet another east/west line, intended to relieve Line 2
-within downtown, it will provide a north/south link between Wuding Road (bar area), Jing'an Temple, and Huangpi South Road (XTD)
-it is expected to have extremely high ridership levels, and I've heard through the grapevine that 2 minute spacing has been planned
5. Transfer stations
a) good
-Century Avenue -- three lines connect there, and the transfer process is seamless
-XTD
-Shaanxi South, but only between 10 and 12; 1 is a bit of a hike
-I'm guessing there are some other good ones, but as intimated above, I lack personal experience wrt a large percentage of the network
b) bad
-People's Square -- ~20 exits!
-Xujiahui
-Nanjing West Road -- remarkably bad because you need to exit the station in order to transfer, and 12 to 13 entails a really long walk
-Nanjing East Road -- not as bad as the others on this list, but definitely not good
-any station that facilitates transfers to the above ground portions of lines 3/4
-Jing'an Temple -- 2 and 7 are pretty far apart there
-Changshu Road -- likewise 1 and 7 are far apart there