And how cheesy he is when he's delivering the serious exposition.

OMGYes. He adds a real cornplexity to those scenes. *waves to Zebra* *g*

I wonder if they will reveal Jack's full backstory over time?

I'm also enjoying the het, but I would really love some hot Jack mansex sometime soon. Or even some snogging, because John Barrowman really does seem like one of the all time great kissers.