I was kind of shocked it was Jack Black when watching the trailer, you can kind of hear it when he says "Who's gonna stop me!" but honestly I think he's doing a good job so far. With Pratt's Mario, it sounds like they're going old school and making him sound like he's from Brooklyn (Mario pre- Mario 64) instead of Italy (Mario from Mario 64 and onward). He had fewer lines than Bowser in the trailer (I think) so its really hard to gauge. I am fully expecting Donkey Kong, what with being played by Seth Rogan, to just sound like Seth Rogan. But honestly, who didn't think that was going to happen when the casting was announced?