Do you want to create another copy of coinmarketcap? They have rating too. But it seems does not popular among investors. Every investor must make own investigation about every coin I think...
I can't speak for coinmarketcap, but we assemble our ratings quite differently. Our ratings are based on a weighted ranking of specific risk to reward ratios, that we believe correctly captures how well the cryptocurrency has been managed in particular environments over the past year. The ratings are strictly quantitative in nature without analyst opinions to sway the ratings.
Ratings are tools for our members that provide transparency and comparisons on how well a cryptocurrency is doing compared to its peers. A tool that can be used or combined with other data that market participants have. The decision is always in the hands of the market participant as to what to do with that tool.
Thank you for your question.
The C50 Index