I also agree, the switch up seemed needless and not really explained. I loved her and Oz, and I was ok with her and Tara(after a little bit)and even thought that someday her and Oz would eventually make their way back to each other(especially after Tara dies) but the last season really stretched me. I felt like Tara was her "One Exception" and hooking her up with the Buffy wannabe just broke me. I totally believe that the bi-thing would have been a lot easier to understand. And Willow has some of the best quotes in my opinion...