I'm sure this cast can do fine, but I really just despise the trend of replacing dedicated voice actors with Hollywood actors "because movie".
Nintendo, you already hired Illumination, so you already signaled that you don't care about the quality of this movie, but why did you think it was necessary to do this in an animated movie? Did Charles Martinet tell you he couldn't do that voice for 75 minutes?
What's with the shot at Illumination? They are actually one of the better animation studios out there.
As for Martinet, go listen to him speak in full sentences in Mario Teaches Typing. His Mario voice is good for short bursts, but is not great when it comes to speaking full sentences.