As a rule, unless you have a very specific itinerary that involves a ton of travel within a single train company's network, passes in Japan are not worth it. This applies to both local subway passes and the sadly nerfed Japan Rail Pass for bullet trains. Even the Seishun 18 (unlimited travel for ¥2000/day, but local JR trains only) ain't what it used to be since they switched to requiring continuous days.

And there are several calculators online where you can punch in your itinerary and it will tell you the best pass to buy, if any.

On my last trip it only made sense to buy a pass for a single ~4 day segment that included two long Shinkansen rides plus an expensive sight-seeing bus.