Episode really does not live up to the potential of its story, but John Frink is one of THE WORST Simpsons writers, so I'm not surprised.
What's sad is it started funny up until the montage. I thought Homer saying "STAMPS RULE!" was delivered really well and timed just right, as well as "WHAT MAN WOULD WANT YOU NOW?". After that it's been misfire after misfire. Really the only FUNNY moments happened in the first act. I don't know what they're attempting with the second and third acts. Took so long to really get to the final conflict what with the stamp museum detour.
That "Land of the Wild Feasts" ad was absolutely atrocious. How on earth did John think that was funny? The whole dream sequence had SOMEWHAT interesting storyboarding (why can't the entire show?) but ran on, again, for WAAAYYY TOO LONG. What was the point of the cops being there if the grave robber sequence never really panned out?
In the hands of a more competent director this could have all been sorted out. It would have made more sense to get Lisa trapped in the graveyard at the middle of the second half rather than at the cliffhanger, then thrust her into real danger. Or just cut out the STUPID crap that should never have left the writers room.