I’m totally fine with the long wait periods between reviews since I supplement this with other resources, but I’ve noticed you get severely penalized if you make an error (at least at level 1).
I had a typo in one of the kanji readings early on, and now my reviews seem to be skewed. I’ll finish up, and it’ll say my next review is in 8 hours, but after that wait I’m simply reviewing one kanji. After reviewing the one kanji, it’s another 6 hour wait.
Does the system simply not behave well at lower levels, or is this intentional? I’m hazarding a guess that later on each review is filled in a little better.