I can't even count how many times I was told to NOT give a baby a pacifier if they are breastfed. (Now for a disclaimer: I am not a lactation specialist or an expert by any means, but I have consulted with a lactation specialist, and have done the whole trial and error method.) I heard things like "that pacifier will be the worst thing you could do if you are breastfeeding", or "if they take a pacifier they will stop nursing due to nipple confusion." So when our daughter came out and was clearly a "sucker" I knew there was no way to keep her away from a pacifier. Granted she did come out and latch right away so latching was luckily never a problem, but I do feel if your baby is not latching or it's difficult, then you may want to try and avoid the paci.
We tried to not give in to the pacifier but she was sucking her hands so much that it led to her scratching her face up, so we decided the paci was the way to go. The nurses kept reassuring us it would be ok because she had been feeding well and some babies are just "suckers" and the need to suck is natural. Once we have in she was as happy as can be and loved the paci.
Today we really saw what happens when a baby who is a "sucker" doesn't have her pacifier. Believe it or not a "sucker" baby will still suck even if they don't have a pacifier, because they will use their own body. Little miss gave herself her first Hickie on her first Easter. She sucked her arm so much that she has a purple spot. Makes me sad, but makes me thankful we did not chose to withhold a pacifier from a baby that wanted/needed to suck. The only problem is when it falls out and she finds her arm while driving home from a family gathering, this results in a Hickie. 
I would much rather have an adorable baby that's happy with a paci in her mouth as opposed to a frustrated baby with a Hickie on her arm. :-(
Again I'm not an expert and these are just my experiences but please understand that sucking is a natural instinct for babies and I'm not a bad mother for giving her a paci nor is she never going to latch again. She is such a happy baby but does require a paci once in a while. 
