It's definitely a plus, I'll admit. In fact, it's the first thing that draws me in, but I find myself not liking romances if overdone. I enjoy it only if it makes sense and doesn't botch the show.
It totally depends on the character's personality. If it's someone I really like, the roasting kind of a person, then I'll be eager to find out how they'll interact with another likeable character. In the end, it's about the mix of personalities, you know? A roaster and a villain maybe, a cheerful pal and a sweet one, two jesters, two egotistic ones... And the list goes on. As long as they remain true to their core, entertaining characteristics, I'll enjoy a romantic sub-plot.