Amalux, I work with a lot of Mac software, and I can say with confidence that DD is not the worst piece of software ever made. DD 2.5 is a lot more stable that all prior versions of MacSpeech Dictate.
If you're running into problems with DD, I suggest you let us know what Mac hardware you're using, and maybe also do a video screen recording of DD on your Mac to show what problems you're experiencing.
I'm not saying that DD is perfect, but I now use it to write most of articles, mainly because my typing is so slow (40wpm) and spend a lot of time hitting the delete/backspace button. Wile DD has its problems, it doesn't misspell words and it types three to four times faster than I do.
Nuance has shown their commitment to improving this application. Hopefully Apple also has plans to integrate speech to text technology within OS X.
Again, let us know specific problems you're experiencing. I don't work for Nuance, but I'd be willing to assist you, because I think DD can be a useful program for people who don't like doing a lot of hand typing.