The original battelcruiser was designed to evoke a manta ray (just look at the main fuselage), and that sea-animal aspect to it was forgotten in later ships. The BOP at least has some lines that evoke the original battlecruiser and the K'tinga. The Vorcha suffers from a common problem with later ships: a cross section that's basically octagonal, so it's got really only one interesting sihouette (from above) and from the side it looks like a series of stacked boxes. Beveled edges don't make it interesting. It's a problem it shares with the Cardassian ship. Hell, it resembles the Cardassian ship so much it looks like someone flipped that around and stuck nacelles on it.