Well, you’re asking on the WK forums, so you’re going to get a lot of answers in favor of the site. I’ll be a bit more measured and say that WK does several things quite well – it’s very beginner-accessible and I like that it curates readings for kanji which can otherwise be very overwhelming. The selected vocab are, largely, chosen for frequency of occurrence in Japanese literature as far as I can tell which is nice. Lastly, community-made user scripts are easy to install and can really enhance WK’s functionality as well. However, there are other tools that are useful in other ways.
In the hands of somebody disciplined who already has a decent grasp of Japanese grammar (ie, the only thing holding them back from getting into basic reading is lack of kanji/vocab), Heisig’s Remember the Kanji (RTK) and the Core 6k vocab deck on Anki or Memrise can be incredibly powerful tools, and you probably can’t beat this approach for raw speed of acquisition. If you’ll be doing reading as reinforcement, this can be a great semi-immersionist approach.
The Kodansha Kanji Learner’s Course (KKLC) offers hands-down the best mnemonics of any of the kanji-learning tools I’ve tried. Fortunately KKLC can be used to supplement WK or RTK (actually you can use KKLC to replace the RTK book without much trouble, and it may even be preferable to do so), and I rarely do kanji lessons on WK without my copy of KKLC on hand.
The last option is to jump right into native material once you have basic grammar (e.g., simple manga) and struggle along through kanji and vocab as you go along, adding new items to your anki/HouHou/Memrise deck as you encounter them. Some people swear by this approach, but I honestly find it too unstructured and frustrating to use as the foundation for all my learning. Best to be familiar with this method, though, as you will wind up employing this method as you go along and get into reading as you’ll very regularly encounter words you don’t know. To put things in perspective WK will teach you ~6k vocab . . . iirc, 8yo’s have passive vocabs of about 10k words (and a much better grasp of syntax than us); the average adult Japanese native speaker has something closer to 25k - 35k words in their passive vocab (need someone to verify though, right now I can only find a source for English passive vocab). If you use other methods first, you’ll at least recognize the kanji, and this will mostly be an exercise in vocab acquisition which I think is probably ideal.
Anyway, those are the major kanji options that I’m aware of, and I’d recommend you give them all a look and figure out what you think works best for you. The most important thing is to pick something and stick with it at least until you have a solid foundation. Down the line it may make sense for you to change your approach (e.g., I’m considering switching the KKLC + Core 6k sometime after I hit WK level 35), but don’t jump around so often that you undermine yourself.
