I'm mixed about it. I get to buy my girlfriend nice flowers and chocolates and take her out for a meal. Which is good.
The bad thing is it feels like there is so much pressure to deliver an amazing day. And then on that day you have to talk about how much you love them, etc. Now, I don't have a problem with that last bit, it's just that it feels like you have to, and therefore I don't want to. And you can bet that girls compare what their boyfriends and them did on Valentines day; and you can bet some girls get annoyed if a friend's boyfriend did something better, etc. And it annoys me that it seems to be a day where shitty boyfriends pull out all the stops. It's about all the other days in between!
So basically: If no one ever talked about Valentines day then it would be awesome.