When the People Dept person at B6 called and asked me why I'd applied to JetBlue, I told her "Because you're hiring." She was taken aback a bit and said, "Well, I guess that's honest."
I replied that honesty from me was one thing JetBlue could always count on, and then went on to give some other reasons I was interested in the airline.
I got the interview and later the job.
Though there's something known as TMI, and there's no reason to bleed all over the interview table (or jumpseater, as it were), I think the whole "couch all your answers so as not to reveal any downsides" approach is really over-rated. People can smell BS, and they don't like it.