That's a great point too. I cryptocurrencies deserve a classing system better than just "altcoin", "shitcoin", and "memecoin". There's not really an official or unofficial grading system other than these terms and vague terms like "utility token" that help to differentiate one cryptocurrency or token from another in terms of quality, which is a problem.
Here, I got you covered:

But to be more serious, 99% of the other coins would just be dumped into the "Shitcoins" category.