"How is it productive, or informative to tell a mother that her childs legs are more likely to drop of, and the stench of rotting flesh is like nothing I have ever smelt, because I ff?????"
I don't know about the particular comments you're referring to and I wouldn't want to comment on it without understanding something about the CONTEXT in which these somments were made.
"I was not and am not mis informed about ff"
Well - good. That's you.
However, at the moment about a third of mums say they get no detailed information on infant feeding from their midwives during their pregancy, so the fact remains that there are many, many women who have NOT been told about the drawbacks of formula feeding by their midwives and so do not possess this important information while they're still in a position to make a choice. I personally wasn't given this information when I was pregnant - I stumbled across it by chance and was very shocked.
"I am though, flabbergasted that bf mothers truly believe that they are the holy grail when it comes to feeding"
What an odd way of putting this. Many bf mums are convinced that breastfeeding is best for babies (if this is what you mean by 'they think they are the holy grail when it comes to feeding). Of course they do - otherwise they wouldn't be doing it! That doesn't mean they feel they are personally superior to you.
"What people do not mention is the psychological well being of the mother through failing to bf/ sleep deprivation of a baby who demands feeding every hour for 45 mins, as I had with dd1. (who also threw up after every feed)"
No - this is not true. This issue is OFTEN discussed here on Mumsnet. There's not one person who is clued up about breastfeeding who doesn't acknowledge that when bf goes badly wrong it can be emotionally and physically excruciating for mums. However - where they differ perhaps from ff mums is that they don't always jump to the conclusion that the only answer to bf problems is formula. I'd be the rirst person to stand up and say - all women who are struggling with breastfeeding should have immediate access to intensive and expert support, and if their bf problems can't be overcome then they should be given help to make a happy transition to formula.