You know, DB is such a jerk now that I think about it. They kept the kid waiting only to make us feel guilty after doing their job for 'em
Are they understaffed or something? I also know that Maven hired Astrid to kill somebody, and they seem to have failed. No wonder
I actually like Oblivion's system better. You get tracked because you showed promise as a killer, not because you did a good deed
Thus lies the Dark Brotherhoods problem during the time of Skyrim.
They
are severely understaffed, and their numbers drop a little more each year. The Night Mother doesn't talk to them anymore, they have no Black Hand (no Speakers, no Listener, no Silencers...), no Tenets, no direction, no one fears or even much respects them any more, and only one partially active Sanctuary.
The Dark Brotherhood are very much in a bind... until [i]you[/u] show up.
The Dark Brotherhood has quite possibly the best written Quest-line in the game, and the stories you get from people and books while merrily romping through the quests thoroughly tells you what happened in the 200+ years since Oblivion. And from the DB's perspective, none of it is good.
But once you start into the Quest-line, you have a massive part in turning around their fortunes (or making sure they never have to worry about it again simply by going to visit an Imperial Officer in Dragonbridge...).
Trully great storytelling in the Dark Brotherhood quests! I highly recommend it.