I never had a problem with the acting in DS9. And some of the characters were very well written. The problem is the show was just plain hateful. Was anyone really friends with anyone else? It seemed the show focused on cast members fighting amongst themselves most of the time, and I am sorry, I just don't want to see that. Of course we need conflict, but DS9 decided all the conflict should come from within, in contrast to TOS or TNG where it comes from without. It was a soap opera, in every sense of the word, and I hate soap operas.