It doesn't help that they gave Rom a speech impediment that makes him sound like the equivalent of a Ferengi 'tard. Some of the other Ferengis seem to have a bit of a lisp (which I would place on the prosthetic teeth hindering speech by the actors) but my first impression of Rom was that he literally had a mental…

@E. Buzz: Don't forget Ziyal, either. Or the Cardassians from the Science Academy, or Mila - those characters all illustrate that not all Cardies are like that, it seems to be more of a trait of the males/military and politicians.