It's inconvenient and better avoided. Toddlers cry, that's the normal thing. Some are unbearable and then a pacifier is ok but they become addicted and you're easily in deep shit if you travel and forget them or lose them (I had one in each pocket when taking a plane).

I guess most kid don't really need it, parents need it, when they can't bear the cries. But even then I think you just postpone the annoyance. I have a friend whose pacifier story would make a good tv show, with the kid solemnly taking the thing in the dustbin and the father frantically searching the bin at 2am.