Celebrity Voice Acting Tier List:
Celebrity Voice Actors (Literally Voice Actors)
Actor Celebrity Voice Actors (Even though voice acting has a slightly different skillset, they'll mostly manage)
Social-Facing Job Celebrity Voice Actors (Like comedians and talk show hosts and stuff. They at least have experience delivering words in an entertaining way)
Singer Celebrity Voice Actors (They have experience with using their voice in interesting ways, but singing skills don't necessarily translate into talking skills)
Everyone Else Celebrity Voice Actors (Yeah)
Keep in mind, I don't mean this list to say that one tier is always better or worse than another, or that the lower tiers can't give great performances, this is just a general idea.