I do agree on the silly lines and dialogues, but you know, I consider it the lesser of two evils. Considering the dubbers could have done a lot worse that many children's Anime go through in America, I always though Digimon was better handled then many. They acknowledged they were in Japan instead of some made up American city, they kept the death scenes, they delivered and played the tragic and emotional scenes straight, and even kept what could have been the controversial transformation sequences starting from Digimon Tamers, and so forth.
For what it's worth, I thought the dubbers handled much of the series pretty durn well.