Points:
 - SRS: 4 hours, 8 hours, 1 day, 2 days, and it goes on exponentially to a point.
 - 60 levels of around 30 kanji each.
 - Levels organized in order from visually simplest to visually more complicated. (Rather than most common to least.)
 - A system of learning kanji based off of memorizing names of "radicals" and using those names to create mnemonics. (Personally a combination of mnemonic reliance and rote memorization is optimal. Also it's best to create your own mnemonic rather than what's supplied by Wanikani.)
 - Each level includes vocabulary that encompasses every kanji that you'll learn.
The best thing you can do is just try it. The first three levels are free and the community (at https://community.wanikani.com) is always free. You can ask around the forum and whatnot as well.
Keep in mind that I'm doing Wanikani with a perfectionists standpoint and, prior to 6/7 months ago, I had NO exposure to any Japanese whatsoever. For each level of kanji: I learn the kanji and associate mnemonics with them, rote memorize them to a point of instant recall, then let Wanikani's SRS do its work. I'm not sure what this does with my long term memory, but if I see a kanji that I've learned on Wanikani, then I'll be able to recall it pretty easily.
Be careful as many people observe "Kanji reliance" because of how well it works. And one last thing, Wanikani is strictly kanji only. It does NOT teach you Japanese and you should only be using for if you're wanting to be able to read. Many newcomers don't do well, then criticize Wanikani for it. (You can personally see these cases on the forum.)