The only possible interpretation I have of the Prometheus is that it was designed to basically be three Defiant-grade heavy frigates stapled together to a high-performance warp chassis. It goes very fast with a brute force warp core (which is huge because it has to safely split into three warp cores (?!) and then splits apart into three low-endurance but very shooty hulls. It might also be because it's got Type-12 phasers like the Sovereign, but still. The only flaw I really see with the idea is what do you do if the middle of the sandwich gets destroyed. Can the top and bottom hulls reconnect without it?
But yeah it's just...such a weird ship.
Yeah, it's honestly a bit baffling. Like you can rationalise its showing a bit as Voyager being Voyager, maybe the Romulan ships shields were weakened, but even so...
The
Prometheus is like finding a taxidermied Neanderthal still smelling of glue in the private collection of an eccentric Bavarian count, or the recognisable ruins of what looks strangely like a Roman temple in geological strata dated to the late Triassic, or the corpse of a gigantic man washing up from the sea. The mind stumbles in confusion, then recoils in horror as it tries and fails to cope with the hideous revelation. Ignorance is a blessing.
I have been the guy loudly and probably sometimes over-enthusiastically defending Starfleet ship design choices in this thread, and I think there is even a limited defence one can make of saucer separation on say, the
Galaxy class. Having the saucer section be able to evacuate the crew in case of an emergency makes a lot of sense in a lot of ways, especially since the impulse thrusters and lots of systems are mounted on the saucer. The tactical benefits seem more... questionable, but the ways we see the Enterprise-D using it, as either a desperation gambit or emergency lifeboat, make sense.
But the Multi-Vector Assault mode... human reason was never equipped to cope with that.