But there are differences in taste between the Japanese target audience and foreign anime watchers. Here is a table showing shows' popularity as a subject of discussions on the Japanese discussion board 2channel and in the English-language forums on AnimeSuki.
The most-discussed show in both places is Accel World. But the late-starting Hyouka is catching up. In Japan, the other highly popular shows are Saki Achiga-hen and Haiyore! Nyaruko-san. In the West, Nyaruko is similarly popular, but Saki is at a lower level and Eureka 7 Ao much higher.
In Japan, Lupin 3 scores a lot higher than in the West. In the West, Medaka Box, Tasogare Otome x Amnesia, and Sankarea are a lot more popular than they are in Japan.
Here is the full list, make of it what you will. Numbers current as of a couple of hours ago. The 2ch numbers show how many thousand-post threads each show has. The AnimeSuki numbers are numbers of posts:
|2ch rank||2ch||AS||AS rank|
|5||eureka 7 ao||15||823||4|
|7||mysterious girlfriend x||15||453||9|
|13||tasogare otome amnesia||7||668||5|
|17||kuroko no basuke||6||119||21|
|24||hiiro no kakera||3||92||23|
|25||ginga e kickoff||2||20||27|
|29||kuromajo-san ga touru||1||12||28|
Personally, my top show of the season is Sakamichi no Apollon, which ranks 11th both in Japan and overseas. But I also like Hyouka, which is popular everywhere; Nyaruko and Lupin 3, which are more popular in Japan; Tasogare Otome and Sankarea, which are popular in the West; Jormungand, which is middlingly popular in both places; and Acchi Kocchi, which is popular nowhere, but especially not in Japan, for whatever reason.
EDIT: I should have added that there are several shows I can't track on 2channel, because their threads are numbered continuing from previous series of the same franchise: korezombie, fatezero, precure, qb, saint seiya, kimi to boku, recorder to randoseru. As FFF points out in a comment, Precure may be the most popular show of all.