I had an inteview with a BB IB last week, everything went well, the follow up from my interviewer even told me that I "did a great job", and that she hoped to "send me timeline for second round interview" after her meeting with the boss. A week later, I got rejected! I'm really disappointed, as I was extremely intersted in working for them, researched a great deal on Sales & Trading and the company itself. After the interview I even started day dreaming about my future with the firm (reality check I suppose)
Now I'm worried about my chance with another BB firm I interviewd with.. the interview was not as good as the first one, and since the first one rejected me, the second one must also reject me as well... I'm not betting on it!
My lesson from this: take what your interviewer say with a grain (or more) of salt!