I so totally agree about the casting in this show - I mentioned this in the old forum (hi all!) but it was only on rewatching, after I already knew how each story would turn out, that I was amazed by how well each actor was inhabiting his/her role. You don't get that very much, it says a lot for the cast, and for the care they took with this show.
I do think TNT did a terrible job of not promoting it. They would schedule it right after that horrible looking (I never watched it) horror-scifi thing Falling Skies and hardly give you a second to breathe before Leverage would begin. Ideally, they should have preceded it with something compatible IMO.
Wanted to add, CBS does rerun an episode very late at night over the weekend, or they have been lately.