Some folks are only interested in the reveal, while others groove on the journey, and still others like a combination. Personally, I love a good reveal, but I also realize that it would essentially kill most things I love to reveal everything about them. Since I would prefer they continue so long as they journey's good I prefer they keep some stuff to themselves until the time is right. It's a rough balance. Some shows get it largely right (Lost, Heroes Season 1, X-Files Seasons 1-3), while others don't (Alias - at least, past the fall of SD-6, most of Heroes Season 2, Dead Zone, Millennium, X-Files Seasons 4+).
I think most of the reason some folks, seemingly like yourself, want answers even if it ends the show - please feel free to correct me if I'm wrong here - is that a lot of showrunners aren't very good at entertaining until the answers are provided, or they lose their way before they get to them, or the studios make stupid decisions that interrupt, abort, or force changes to the answers. I can understand this, but TV is still a serialized medium, and IMHO operates best when exploited to maximum effect. The shows that manage to keep their shit together all the way through and reveal everything at the proper time are magical, and really, if you can, why shouldn't you shoot for magic?
Kind of, but for me I just fine the spy/intelligence stuff more interesting, and when I saw the premise of the show, the what happened and who did it was far more interesting. I, personally, hated most of the character interaction except for Jake and the FBI guy. They and their backgrounds were far more interesting and what kept my interest.
Since I've always liked shows like 24, Alias, LaFemme Nikta, NCIS, I Spy, The Saint, M:I, the aspect of the show that dealt with that shady or shadowy aspects are far more interesting. The private security company was even a far more interesting then some of the stuff in Jericho.
But again, my tastes. I"m not knocking anyone the likes the show.