I managed to play through 4/5ths of this game up until the final stages on the ship where i just decided to give up and watch the rest on youtube.
I haven't played the other DS9 games because they seem more focused on fun gameplay (Crazy to think people play games to have fun), but I liked Harbinger despite its sometimes bleak gameplay mechanics only cause I actually got to hang out with the characters (You get to tell quark to shut up)
Only recently have I started to peruse DOS games so I can't compare it to others of the same playstyle, it's a solid game to waste a few hours on, maybe just watch the show first