^ actually the ship had "standard phasers," they were "fast but not giants." And the Enterprise, which withstood several passes of the vessel, only needed one connecting shot to cripple them and render their suicide mission moot.
The Orion blew away "number two" shield. It might have won. By the end, the Enterprise
was hanging by a thread.
The way I rationalize what happened, the reactor on the Orion ship was about to go critical anyway, so they chose to slow down for the final attack, on the assumption that the Enterprise
really was as crippled as she seemed. If they had fielded a fresh suicide ship at that point though, the Enterprise
could easily have been toast.