My experience with love spells is that if done correctly they can work wonders. Now I've never tried or created a love spell with the intent to Force someone to fall in love, I've done more like, making someone pay more attention to an already existing love, or think of me spells. The ones I've created have worked for either me or one of my friends, to atleast a minimal extent. But love spells are tricky.
If done incorrectly or done out of an unpure intention, love spells can backfire and make someone dispise you, So when trying a love spell it is good to take extreme care that it is done well.