I have a upload that has 500+ downloads, and another that only has 200. What do you think is a successful amount of downloads?

depends what it is and if people actually use it.

i have 300+ downloads on one of my tracks and i know people will either look at it once and never use it again or just not bother installing it. that doesnt scream successful download.

successful downloads are the ones that actually get used by pretty much everyone, like mobys steel jungle. nearly every B&M track we see on here uses that set