I wouldn't expect anyone to come away with a huge appreciation of anime from only watching films. I was disappointed to see both Akira and Ghost in the Shell on the marathon list, because although they're important milestones for anime in cinema, I don't find either to be especially good films. I doubt Adam and Sam have much free time for watching things other than movies, but I think series like FLCL, Paranoia Agent and Haibane Renmei show what anime can offer.