Depends how you look at it. I think they kicked a lot of ass that day. In fact, a fellow I went through basic with was on that mission and he is quoted in the book as saying after the run out of the city 'don't feel sorry for us, you ought to feel sorry for them (the Somalis) because we kicked ass'. He was shot in the back not too long before he said that as well.
That mission was considered a disaster because of the numbers lost when America was no longer used to losing troops. They accomplished their objectives that day though on a very trying mission- no armor would've kept those Black Hawks from being shot down.
I don't think the Rangers got creamed that day. I know this a popular way to look at it but I don't agree with it.