I think BlueLabel kinda said it all.. from our side it's really hard to judge how we preformed.
1) We're nervous and anxious and have our rehearsed answers in our mind so if our responses aren't what we thought they would be, we think we've done badly. But honestly, they don't know your answers or how you planned on saying them and they really do take into account nerves and so in that respect.. you don't know.
2)We do the research on the school and the interview process but we don't know what each interviewer is looking for in an applicant (perhaps a good reason we get usually get 2 interviews).. You just can't anticipate this and with "poker faces" it's hard to tell how we did afterward.
3) You are you're worst critic.. we all have a high standards that we hold ourselves too (else we wouldn't be applying) and sometimes we judge ourselves to harshly...plus it's easy to compare ourselves to other applicants (esp on SDN) and feel like they're doing so much better.. remember most of it is a front and not everything is as smooth as it seems
😉
Last thought.. I interviewed with an A&M prof that grilled me a bit: he liked to play the devil's advocate and take the other side of EVERYTHING I said! It was tough, I'm not going to lie..I left and my knees were kinda shaking

But of course, I told the other applicants in the meeting room that everything went well
😎 I matched...