+1 @frankypiccolo share a link to your rejected file and that will help osmeone give you advice.
Regarding a list they go by - while yes it would be a nice idea, I am not sure how it would work.
They are chosen because of their expertise in their field and their knowledge of the marketplace so for example website (just because I know more about these) they will look at the principal stuff around design (e.g. hierarchy, layout, fonts, alignment, originality, modernization etc) and development (e.g. coding, validation, optimisation etc.).
I imagine they get a ton of files everyday many of which are nowhere close to the standard - this means that to do anything more than what they do now would mean more time (which authors already complain about) more effort and it will still come down to the same thing as it does now… what a reviewer classes as approval design.development/creative or otherwise may not align with what an author thinks this is and with or without a list that won’t change. In actual fact it is likely to cause more issues when authors argue that they have ticked all the things on a reviewers list.
With respect to ALL authors - reviewers are not here to teach anyone how to design, develop etc. and assuming a file follows best practice fundamentals and does not resemble others on here then there is a good chance it would be approved.
Hopefully that makes sense.