Willow/Kennedy - Obviously this was less than intriguing. To begin with many of us were still attempting to get over Tara's death and the sinking of our ship. Also, aside from one episode, this couple had almost nothing to do. They had sex that night, Willow turned into Warren and Kennedy 'brought her back to life' or whatever but aside from that there was some making out and some arm touching and some of Kennedy hanging with the Scoobies when she wasn't wanted (by me.)
Buffy/Angel - Naturally this earns me some hate. I am most certainly not dissing the ship entirely because I enjoy it in parts. But if we look at it overall it is a little dull. This ship thrived in season two, especially during the Angelus portion. But come season three this ship becomes nothing but irritating sexual tension that I cannot personally bright myself to care about. It becomes tedious and tired frankly. Him leaving was good because as a character he got so much more tolerable without this boring ship tethering him down.
Angel/Cordy - This is most certainly on my list. This storyline was not needed and ruined aspects of both of the characters. It made things a little dull, I don't know how to put it. I mean, they made sense...If you look back to Buffy season three you see when Buffy was late to her date in 'Halloween' and Cordy sees Angel and they start talking that Angel is obviously amused by Cordelia. She actually makes him smile and laugh in a way that I truthfully never saw Buffy do, at least in those early days. However when the writers attempted to make them a couple I realized I couldn't stand it, though I'm unsure why. Therefore I was bored as it appears many others were. 🙂