I can't figure out what makes a ship work for me.

Not very many fictional couples get me excited, and of those that do, Raoul/Christine and Will/Elizabeth are the only ones that really have anything in common. My reactions to most romances in fiction are "Ugh, shoehorned love interest" or "I like these characters as individuals, but not together" or "Yeah, sure, they make a cute couple, but I'm not really feeling it."