Book 4 just doesn't feel cohesive; it feels like these are a bunch of mini stories centered on Korra, but there's no overarching theme to it all other than "make Korra feel bad". I'm all for humiliation and berating Korra, that part is great, but the actual story; its cohesion and how it's all put into the world seems very lacking compared to the previous two books.
Fully agreed. There is a ton of good content in this slave route, but it hasn't been put together in the best of ways.
Remember that Korra has stats? It's easy to forget since I think the whole business of slapping her and breaking down her resistance was dropped after a couple of updates.
Then they introduced the "adventure game" segments where you walk around Aang Memorial Island and the city streets, and it ended up being completely underutilized and could have just been two normal locations you visit (in the style of the police station, Shady's alley etc.), for a lot less work and headaches for Mity.
Compare this to the Lake Laogai tunnels in Book 3, that were used throughout the whole story, tied in with your earthbending training, and introduced new girls. That system was just a lot better planned and more rewarding to play with.
The story has lacked focus and at times there's been no ongoing story that can hint to where you need to go next to continue, and you have to resort to just re-visting all the places and talking to everyone to trigger the next content. Which is made harder by the fact that there are so many ways to talk to people - some use normal locations, some are in the "adventure" maps, and some you need to call from your study (and Zhu Li is present in two of them!).
Two or so updates ago we got to go on a boat trip to the south pole. While it was great to meet the twins, the event felt random and had no place in the story. And then in this update we just as randomly get to re-visit and replay the south pole scenes, which makes you wonder why it was a time-limited event in the first place? And wouldn't it have been simpler to have the twins come to us in Republic City and have them stay in a hotel? Having Korra's mother and Katara be on vacation in Republic City would have been no problem at all to make up an excuse for either.
The various sex scenes with Korra have been amazing - the titplay, the titfucking, the footjob, the spanking, watching her work out, tying her up and raping her while dressed as Amon - but the route on a whole hasn't been nearly as good as it could have, due to poor planning and an overambitious scope.
I hope they know their limits for the love route, and keep it smaller and more focused.