Absolutely not. Especially not a 'good' one. I don't fantasize much, coming up with a paragraph would probably take me weeks. Besides, I don't like reading romance themed bookes, so writing one would be too much of a punishment for me.
No. I could probably come up with good characters but that would be about it. I don't have the patience, dedication or imagination to write a good novel. Also what do I really know about romance.
I would fear to be too cheesy, and this is what I dislike...so maybe something that mixes love and absurd (and I don't think you have to know a lot about love to write a good novel)