Oddly, I have the reverse opinion- I quite like the prow, but the rest of the design seems lacking. It's got that same feeling of not quite fitting into the DW world.
I like the prow too. I think the perspective on the drawing is off, which can make it feel wrong without being clear as to why. Uncanny Valley sort of thing.
Having gone back and looked at the Spartan versions of ships and back at the WC concepts closely to pick out what is really different... Well they really aren't that different, they do share a lot more than they are different. It is just that you have to focus on each part of the WC to see it.
They really seem like good designs hidden behind bad drawings. The consistent heavy lines pulls the focus away from the overall design and focuses it on every little detail making the whole thing seem cluttered. Not being able to see the forest for the trees sort of thing.
Going to their site and looking at the art they seem to be all over cell shading, which isn't a bad style, I happen to like it a lot in some games.
The irony of course is that that style is all about "less is more," boil everything down to it's essence and have a few very distinctive features define the whole. But these pictures come off exactly the opposite of that.