I always saw the Ent B as a step toward the Next Gen ships with the wider areas around the deflector dish. Now the Ent C seemed to be a cop out with the exception of the nacelles. I have to admit that the C seemed to be a better B. But as I mentioned elsewhere, the excelsior class always seemed a little like an aircraft carrier, with the flat top of the engineering section. Imagine a series that was Trek meets Battlestar. This is based on a supposition that the shields of a ship could be overloaded by multiple hits simultaneously, or somethin'.