I have to admit, I was never a big fan of Willow/ Xander, for the same reason that I'm not a fan of Xander/ Buffy. They're both very one-sided crushes- for the majority of the show, Buffy and Xander see Xander and Willows (respectively) as friends, rather than romantic interests, but both Xander and Willow act quite... I guess entitled is the right word for it, towards their respective crushes. They both give of the "Nice Guy" vibe regarding Buffy's relationship with Angel, and Xander's relationship with Cordelia, and pretty much anyone else. Xander's line about "I guess a guy has to be undead to make time with you", and Willow's snapping at Xander that they were "not OK" after she found out that he was dating Cordelia kind of makes me want to slap them and give them a lecture on how it is not up to them to dictate who their friends can date. It's one of my pet peeves 😛
I loved their friendship, mind you. I love that, when it comes down to it, they've got that really strong bond there, where Xander manages to talk Willow out of destroying the world, and when Xander calls Buffy out on her behaviour in WSWB because of Willow being in danger. I just don't really like their romantic relationship, and the entitlement that comes with it.