Absolute must-have for anyone wanting to spice their Mario 64s with some characters that don't feel like cheating or breaking the game's limits. The unique moves feel good to use once you get used to them and I'm all for the voice acting. Sure, some folks would like it better if they used NES sounds or original clips from older titles, but having them acted by the team and guests makes it feel that much more unique.
Maybe some of the characters could have a few more differences, maybe some could be even more unbalanced or wathever, but I like that they feel fair and as close to the original Mario 64 experience while making them feel new and even official, like they are true add-ons or DLC we never got for the DD64.
Few mods are worth removing this one from your list, it's just magnificent and I hope they keep adding some new characters, maybe some from the DK series or more fleshed out Sonic the Hedgehog pals, because this team is likely to make the best versions out there.
I love this and everyone involved should be proud, it's perfect.