Chances of getting your map put into the community playlist..

are pretty low. This is because Bungie receives over 9000 maps made by people like you daily. I played a few really good ones that made it onto the community playlist and had a few thoughts along with a few screen shots. They are here -

Contrarily, they are rather high. If you are a decent forger, then you have about a 1/50 chance of getting in (seeing as the majority of maps were punted, not including Ziggurat and other trash). If you are an above average forger, then you are in the playlist, and if you are a great forger, then you are a runner up in Forgetac.