Yes of course.  Although the fashion is for reportage and candid wedding photography, I’m a classically trained wedding photographer which means that I ‘grew up’ learning how to pose and take wedding groups.  I still think that they have a part to play in your wedding photography day although I also love the reportage style.  They don’t need to be stiff and formal but they do need to be done professionally and with all the attention to detail you should expect from your photographer.