I am not going to say that you shouldn´t, as you see, you can learn about animes and have fun.
You have to be aware of those slangs, typos and mistakes that they do on purpose (not by chance). In other words, you have fun and get information, you learn but don´t study seriously.
You can do both, making them separate events, though. Even use the slangy and informal way as basis of comparison (if you have enough free time, I mean).