I registered on this forum after googling the words, "I hate Jadzia Dax," so you can pretty much expect me to say negative things about her.
I always kind of knew I didn't like her, but after rewatching the episode Playing God, now there is no more doubt that I completely hate her.
A couple of things to start, and I know other people here have expressed similar sentiments:
1. Dax redefines pretentiousness to an astronomical level-We are supposed to understand that a large part of this attitude comes from having absorbed part of Curzon's personality. The show frequently references how cocky and overconfident Curzon was, so to an extent I tried forgiving Dax for this disenchanting quality. Remember the terraformer in the episode Second Sight? The one who admitted constantly to being a self-absorbed egomaniac? Well that was amusing for maybe half the scenes I watched him. However, with Dax, we're treated to similar levels of egotism, but she holds back just enough in most episodes that I just manage to avoid being nauseated by it. No, wait. I'm always nauseated by it. I just barely avoid throwing up over it. One of the most annoying scenes in the Playing God episode is when Dax and the Trill initiate are at that Klingon restaurant and the Klingon chef is singing Klingon opera. Nevermind, Dax, that your initiate is visibly uncomfortable or that he probably doesn't like Klingon food to begin with, but why don't you go ahead an be oblivious to the sensitivities to people around you and just stand up next to the Klingon chef and sing opera with him. Yeah, do that! It's like if you've ever dated a girl for the first time and she needed you to know that she played classical piano. So out of nowhere, while you are picking her up at her house and in her living room waiting for her to get ready, she comes in and just starts playing the goddamn piano for some reason. It's as transparent as this thing Dax does in this episode. But that's okay, Dax. One of your previous hosts liked Klingon opera, right? Well you're always insisting you're not like Curzon when it's convenient for you, but when you want to do something as pretentious as this, just say it's cause one of your previous hosts compelled you to.
And why the hell did they go to a Klingon restaurant anyway? It's like that one pretentious friend who invites you to sushi to display their level of (feigned) sophistication. I'm sure she told him about what's best on the menu and how to properly order it too. Something she had understood long before him.
2. We get it! You're Dax!-Being a Dax in the Star Trek universe seems the equivalent of either getting a cool tribal tattoo, having backpacked across the Andes, or doing charity work for most people. You know, it's just one of those things that you feel you must tell people about every chance you get in order to maximize your level of cool. Since Jadzia herself as a character really has no depth (shown both by Farrell's lack of acting range and the writer's refusal to develop her beyond the fact that there's a slug inside her), she just falls back on being a symbiont host as the main thing that's interesting about her. And you're not really showing different sides to your personality simply by playing Dabo with the Ferengei or organizing all your favorite alien classical composers to listen to on the runabout. But holy cow, if she ever does fail to be interesting (always), all someone needs to do is point out that she has several lifetime experiences. "But you're just a young woman! What can you know about this??" "Oh but I'm not just a young woman! Little do you know...." And so on....
I don't even mind so much that Sisko endearingly calls her "Old Man." If only this didn't go to her head so much. If I was an amalgamation of past people's lives and personalities, I think I'd be embarrassed by this fact and try to keep it low key that a good portion of my personality is really the sum of so many other's. But she flaunts this all the time like it's something really to be proud of. And don't just tell me that it's an honor for them to have this alien lifeform in their body. If it was such an honor then maybe she'd carry herself about it with a more quiet dignity. But as far as she's concerned, if someone's gonna put a damn squishy slug inside her, well then she better get exclusive bragging rights on it. But remember how she only brags when it's convenient for her. It's like, when people remind her, "But Curzon used to say..." She's always like, "Well I'm NOT Curzon!" But if people say, "Gosh, you're stupid aren't you?" Then she's like, "Um, hello!? I'm Dax?"
3. Stop cock teasing Quark and Dr. Bashir-To be fair, every time either of these two come on to Dax, they are pretty damn corny about it. But at least when Kira turns a man down she gets all butch and in guys' faces about it. Dax's style is more like, "Mm, yes we'll see. I may never let you poke me, but that doesn't mean you shouldn't keep trying." It's just that how many times can viewers tolerate watching these awkward scenes of these two men coming on to her? It was kind of pathetic, really boring to watch, and above all, utterly predictable. Early on, Deep Space Nine was gaining a reputation anyway as merely being the Loveboat in space. I don't know, maybe these awkward chemistry-lacking scenes is what pissed off the Jem'Hadar and forced the whole Alpha Quadrant into war with the Dominion. And we all know the show got better at that point.