I never liked Tara, because she always struck me as too manipulative. I also found her relationship with Willow rather sickening ... because the way they spoke together would have been sticky-sweet for any couple, gay or straight. It was like the producers and writers were trying too hard to make the relationship fabulous because they were lesbians and they just went too far. But I would have been all for the two of them finding happiness together if I didn't dislike Tara and the way Willow acted when she was around her ... and the whole Oz thing. Maybe Willow was ready to break up with Oz, but I don't think that many viewers were!
I also found it strange that after Willow became romantically involved with Tara the writers acted like she had been gay all along, like she didn't like boys at all. Um, what about Xander? What about Oz? The girl was bisexual, and it was odd that the producers shied away from that.
One of my daughter, who is a big Buffy fan, has made up her mind that Willow and Oz are together. The show is over, comic books and other media are not canon, and she figures that Oz and Willow found each other again because it was inevitable. Kennedy was like Tara only worse; it couldn't have lasted. Being a stubborn woman, my daughter refuses to hear otherwise.
And since I like her version, I tend to agree with her.