Dubbing in general I think has been considered a rush job for years anyway. Foreign films suffer the same issue with stilted dubbing all the time, and anime just isn't any different. It's also cheaply made (4KIDS was considered an exception to the rule because they actually poured money into their dubs), the voice-actors get paid peanuts to dub, and most of them don't want to be in a cramped recording booth for hours on end. It's a thankless job.Robotech can also be excused for this being the first acting job for most of these actors, and that most voice acting in general was often pretty goofy and sometimes downright awful back in the 80s and 90s. And Anime wasn't really treated much differently than any other cartoon at the time.