Apparently Rousey actually has a significant speech disorder called apraxia that she dealt with as a child and that I imagine still affects her ability to speak today. When people discuss her poor performance as a voice actor here, I think it goes beyond simply being bad at the job and actually has at least some relationship to that speech impediment.
It’s sad to me because if she didn’t have this history of being a complete asshole transphobe Sandy Hook truther, it could have been a bold and even heroic choice to have her voice a major character because of overcoming apraxia. She has been an advocate for the condition, which affects children, and that’s a good thing.
Unfortunately, one thing does not cancel out the other and she just has this long history of being a dirtbag on top of that.
This is why when I’m critical of her inclusion in MK11, I keep that criticism centered on her shitty opinions and history of awful behavior rather than her performance (which I do agree was not good but… if we were in a world where she hadn’t been spouting shitty opinions for years and was instead a decent person, I’d probably feel like it was fine given her apraxia).