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The entirety of GSC's Kanto.
>Incredibly rushed, took development time away from fleshing out Johto instead
>All of the interesting maps have either been removed or downsized to a comedic level
>Trainers aren't a whole lot stronger than the threats you faced towards the end of Johto, gym leaders are mostly pushovers
>The very last Rocket you'll face is some nobody grunt on Nugget Bridge
>Fun activities or story events are nonexistent
>Unlike BW2, there's zero new towns or dungeons to justify revisiting the region
Beta Johto was better and one of the big reasons for that is that it knew to keep Kanto as just a small chunk of its larger world.