In that case, they ought to have their own language suited for their mouths, and be able to understand that one perfectly

It's probably preferrable for minotaurs to be able to understand each other in 'common' though, since you don't have the concept of racial languages implemented.

Anyway, it doesn't make much sense that a fairly intelligent race shouldn't be able to communicate with each other perfectly - if not by speaking perfectly, then at least by knowing what it the means when another minotaur speaks gibberish. One must assume that minotaurs would be used to hearing their own kind of speak, and therefore have no problem understanding it.

>It's not an accent. Their mouths aren't well suited for
>language. Thus, minotaur-to-minotaur communication isn't
>easier than minotaur-to-other.