As it is, Japan is a good civ (UA is great when used properly, Samurai can get blitz or charge much earlier), Zero can definitely use an upgrade, or replacement.
Compared to India, who will have a happiness penalty early on (when it is harder to get), and a happiness buff late game (when it is pretty easy to get), doesn't work well. In addition to a very mediocre UB (culture on a building you only build in some cities, compared to Siams Wat, and gold bonus late game), and a UU which is useful for defense, but worse than useless when upgrading (and ranged promotions carry over, massive penalty to future promotion rate).
Yeah and India has one of the best UUs & Mughal fort is freaking awesome!
On a serious note, Japan is even in more need of a change than India. A UU with one more average promotion, dumbing down one of the best melee fighters, no thanks. A UU with Zero value. And a UA which was heavily nerfed in G&K.
I think Firaxis could take the idea from GEM mod. There Zero is replaced with Dojo building (barracks replacement) which provides XP trickles to garrisoned units & culture on strategic resources. And samurai starts with blitz. That makes them a very strong civ.
Similarly Indian UA is changed to gain in pop whenever a food building is built which is also quite handy.
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