Rush hour Tokyo trains were a dream, people are polite and queue, but they queue so that they're not in the way, the carriages are surprisingly head-roomy for 6'4 me, unlike the shit show of the central line, they're cooled properly, like the circle/district and the stations were almost universally clean and spacious unlike our tube platforms which are often cramped with tiny exits through archways blocked by people filling the platforms.
I'm not saying the London Tube is bad, but I would take Tokyo subway over it any day.
It may be controversial to say but tourists (local or from afar) are generally the worst part about central London commuting, due to the ignorance of the etiquette, especially when tourist numbers can be overwhelming in some parts.