it does what it aims to accomplish: allows for extra characters (and even movesets) to be added to mario 64 without overwriting the original cast provided by CoopDX. i love it!
i think my only criticism is the UI. it doesn't feel very mario 64-ish outside of the font. maybe in the future the UI could get an overhaul and utilize 64-styled textures... similar to the file select screen or even the title screen (like the CoopDX mod site), maybe! who knows
boasts a lot of features for devs; custom voices, custom health meter, custom moveset toggle, preset palette, dialogue name replacement. it's really nice! i'm not just saying this cause i added custom health either LMAO. it's really flexible in terms of letting you add whoever you can imagine. having that much ability to change stuff is fantastic. i think my only suggestion would to be able to have multiple preset palettes... would be pretty cool i think