I see my two of my old rejected levels show up here: "weird 3d speed" and "smooy corse"! There are even more of them I have. I should make a pack for them soon.
Some levels that are here might be here because they had minor issues that the level creator never fixed so they ended up rejected. But honestly though, the general mass of levels in this pack really don't deserve to be accepted.
I would have preferred 100 newest rejected levels, as it shows the standard of today, and what levels are getting rejected now, without picking the levels you now wanted to show here (for example my level). Of course I know I was still stupid right then and I am not trying to hide the level (as seen in my own pack), but it is still something you could think when making pack of rejected levels.