Jake, my level which is designed for at least 8 players(or more) was made in two weeks so i must disagree. A really good sp pack requires a lot of time, more than half a year(I just know that, maybe im too lazy for making a sp level pack, but one level took me about 3 or 4 months and its still unfinished[but its size is about 400x200 so it can be explained easily, but still, Im too lazy, or maybe I just get bored of that]).

I agree with SE, not with deleting levels but with the idea to not include crappy level into sp level pack. Or to include it to show how crappy it is. But in my opinion if your level deserves a 4 rating it can be included into the whole pack. You wont get 10 rating anyway.

To answer the question, how to create an epic level? I don't know, I just like doing levels. I am mostly making levels without any plan, but with inspiration. Then it works perfectly. If you try to force yourself on creating a level then it can end badly. Try to see a levels rated between 8 and 10, and see for what people liked them. Maybe not for an ideas, but for nice, simple layout, eyecandy. I mostly like to do eyecandy. Also, try to make events like float ups visibile(I dont like when I cant even see a simple up arrow or a fan below me which can tell me that when I will step over it it will float me up. That's why I prefer to use springs). The same about belts, but for belts there should be a special animations.

At first you should make a simple duel levels. If it gets good rating maybe try something else(map for a different game mode), or just create a bigger map. If it feels crappy ask someone, maybe he/she will like the crappines of it. And that's all.