1. Utility
2. No anonymous devs
3. Active development and continuous changes
This is 3 of the things i do really much prefer on seeing before i do make investment with some altcoins specially if its new even though its not really that precise
nor give out assurance of success but still you could really still have some chance on hitting a good project rather than on having no criteria at all.
I think you stated the criteria for a new project but for altcoins that are already listed on trading it is necessary to review the liquidity on the exchange, as well as interaction and support from the community because projects do not thrive without a solid community.