Nothing about the sonnet is perfect for the love poem, either. Genre simply provides a way for the reader to look for things that have been done. A form is a useful thing to use. It has history and resonance. It informs you as to the way things have been done in the past.
“I don’t know what the voice of my poetry is. I suppose it’s mine but it is a part of me that I’m only in touch with while I’m writing. I don’t see it as like my conversational voice or like anybody else’s voice that I know. It is a voice that occasionally intrudes in my ordinary thinking. Suddenly a line of what appears to be poetry will pop into my mind and I will have no idea where it came from.”
John Ashbery