Example: the Valen Dreth contract. Ocheeva says that no member of the DB has infiltrated the prison successfully in over 300 years, yet it's perfectly possible to do this quest completely undetected even without any magic.
Fran?ois Motierre. Vicente doesn't want to give the contract to anyone but the PC, the new recruit. All the others have years of experience yet the PC is chosen for this contract.
Adamus Phillida: Three assassins have tried and failed to kill him. The PC succeeds.
Doesn't it seem like the only truly competent people in the DB were the PC and Mathieu Bellamont? Maybe the Night Mother had a point in allowing so many members to get offed. Or the writers got a bit lazy... Either way, it makes the DB a lot less threatening to me. What do you think?