Sometimes I think Jerry didn't "get" Babylon 5. He loved the gig, he loved acting in general, and he certainly loved the part (or he would not have done it so well). But going by his comments I've heard, he seemed to miss a lot. His DVD commentaries were usually limited to him wisecracking, recounting old stories, making fun of Delenn's speeches, and preventing Bruce Boxleitner from ever saying anything meaningful. In contrast, Bruce seemed to "get" the show a little more.
In extreme contrast to Jerry, some of the BSG cast and all the Firefly regulars seem to really enjoy the show not as a cushy gig but as a true work of art. The Firefly actors seem to know more about the show than anyone besides Whedon himself because they loved their characters so, and wanted to know everything they could. Nathan Fillion's commentaries tend to be funny and insightful.
...wait, this is a B5 forum, right? Not Firefly? Dang.
*runs*