The Klingon Bird of Prey as a logistics warning

What is the worst starship class in Star Trek?

The Bird of Prey is nominated because captain-specific internal layouts and weapons complicate logistics, though another answer points out that the term covers several classes and reflects separate great-house fleets.

Bird of Prey is described as a category spanning several Klingon classes. The hulls have some common features, but individual captains determine internal arrangements and weapons. One answer calls this a logistical nightmare. Another notes that the system has worked and fits a society whose great houses maintain their own fleets, while still accepting the drawbacks of limited standardisation.