The problem with LoK, isn't actually that it introduces too many characters, the problem is, that too many of the characters it introduces, become main stays in the series.
The Bei Fongs should NOT have had so much screen time, why Toph's entire family became so important anyway is beyond me. There should have an arc for them, like they had in season 3, and that should have been it, they should have been relegated to the background, with some guest appearances from Su now and then, since she and Lin are the only ones from that family who matter anyway.
Lok basically became the story of Korra and the Bei Fongs, when it really, REALLY shouldn't have.
Anyway, I really need to try and get some sleep. It's 2:50am and I need to wake up at 6:10am for a 9 hour shift at work. It seems like my body has become accustomed to staying up till the early morning talking about Avatar this past couple of weeks though, cause I am struggling badly to fall asleep lol