I used to love khanacademy, I thought it finally made math fun. But after a while, it got kind of old, and it wasn't as much fun. The graphics and site quality is really good. But some of the problem wording is really confusing, and some of it just isn't that engaging. I'm guessing a majority of people will disagree with me, but I just didnt think that it stayed interesting after you saw it for a while.