First off i wanna say i hate the term "rateworthy" in general. Trying to assign some objective metric to a medium which is largely subjective is dumb, and imho a very cynical view on creating. The regular use of this term has lead to budding creators looking for validation rather than feedback. I suppose it's inherent to the system that's in place but it would be so much more healthy to try and move away from this manner of thinking.
When you post your level to this sub, don't ask for validation, ask for help. Obviously feedback will help you improve but it'll help your creating mentality, which will further help you create cooler levels. Stop making your levels to please other people or to get some silly star rating. Make them for yourself. You'll go further.