I dunno man, I've been here before plenty and have figured I was gonna live here for the past 10 years, kinda late on realizing that idea but I'm here... I don't think anything can be as bad as the 8 years I spent in Seoul, not as far as cultural oddities and frustrating dumb people go. I'm pretty used to the 6 to 10-person delegations when it comes to asking the most mundane of questions, the racism, and brainless consumerism, the weird police questioning, and paying out the nose for silly imported things.
On the other hand, I don't really plan on going out of my house a lot in Japan, apart from going out to eat and buying life necessities, and the occasional nature trip for some fresh air.
Thinking about taking up fishing soon. Already done most of the Tokyo touristy stuff in the past, looking forward to buying a car someday and going to Karuizawa or something.