It's a waste of time. It was created by greeting card companies, candy companies, and florists. If I don't do enough the other 364 days to convince Mrs. Kenney she's the best thing that ever happened to me, nothing I do on February 14th will.
I think it is blown out of proportion. I think if you love someone you shouldn't need a holiday to say so. It just adds stress to people with tight budgets and makes those who don't have someone feel left out.